US Pat. No. 9,582,940

SYSTEM AND METHOD FOR IMAGE COMPOSITION

SHANGHAI UNITED IMAGING H...

1. An image composition system comprising:
an acquisition engine configured to retrieve a first sub-image and a second sub-image; the first sub-image corresponding to
a first set of 3D volume data, and the second sub-image corresponding to a second set of 3D volume data;

an image processing engine configured to perform operations comprising
retrieving a first overlapping image from the first sub-image;
retrieving a second overlapping image from the second sub-image;
generating a first 2D projection image and a first pixel map based on maximum intensity projection of the first overlapping
image onto a plane;

generating a second 2D projection image and a second pixel map based on maximum intensity projection of the second overlapping
image onto the plane;

performing 2D registration based on the first 2D projection image, the first pixel map, the second 2D projection image, and
the second pixel map;

performing 3D registration based on the 2D registration, the first pixel map, or the second pixel map;
identifying a correlation between of the first sub-image including the first overlapping image and the second sub-image including
the second overlapping image based on the 2D registration or the 3D registration; and

fusing the first overlapping image and the second overlapping image based on the correlation to provide a composite image.

US Pat. No. 9,417,305

METHOD AND APPARATUS FOR RECONSTRUCTION OF MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. A method for reconstruction of magnetic resonance imaging comprising the steps of:
collecting data in each initial channel and filling said data in an initial K-space, said data including data in a calibration
data area and data in an undersampled area;

constructing a target virtual space Sp, and mapping initial K-space data to said target virtual space Sp;
constructing, in said target virtual space Sp, a target optimized virtual space Sp1 by retaining channel data having a high signal-to-noise ratio;

filling out said undersampled area in said target optimized virtual space Sp1 and acquiring complete data in said target optimized virtual space Sp1;

converting said complete data in the target optimized virtual space Sp1 to an image domain to obtain an image.

US Pat. No. 9,696,439

APPARATUS AND METHOD FOR PET DETECTOR

SHANGHAI UNITED IMAGING H...

1. A positron emission tomography (PET) detector, the PET detector comprising:
a crystal array, the crystal array comprising a plurality of crystal elements and a light-reflective coating mounted on a
surface of each of the plurality of crystal elements, the light-reflective coatings defining a light output surface of the
crystal array jointly; and

a semiconductor sensor array comprising a plurality of semiconductor sensors for receiving photons from the light output surface,
each of the plurality of semiconductor sensors contacting at least a portion of the light output surface of the crystal array,
wherein the light-reflective coatings mounted on the surface of each of the plurality of crystal elements being set based
on an area of the light-reflective coatings, a relative location between the semiconductor sensors, and relative positioning
between the semiconductor sensors and the crystal array.

US Pat. No. 9,697,623

IMAGE RECONSTRUCTION SYSTEM AND METHOD

SHANGHAI UNITED IMAGING H...

1. A method comprising:
obtaining a projection image of a projection object;
pre-processing the projection image to generate a processed projection image;
reconstructing, by a processor, the processed projection image to generate a reconstructed image including an artifact; and
removing, by the processor, the artifact in the reconstructed image, wherein the artifact includes a detector edge artifact
relating to a detector edge, a projection object edge artifact relating to a projection object edge, and a serrated artifact,
and wherein removing the artifact in the reconstructed image includes:

removing the detector edge artifact;
removing the projection object edge artifact; and
removing the serrated artifact;
wherein pre-processing the projection image comprises:
segmenting the projection image to generate a segmented projection image;
generating a negative film of the segmented projection image; and
correcting a geometrical error of the negative film of the segmented projection image.

US Pat. No. 10,140,735

IMAGE RECONSTRUCTION SYSTEM AND METHOD

SHANGHAI UNITED IMAGING H...

1. A method used in digital breast tomosynthesis (DBT) for image reconstruction comprising:generating projection data of a projection object using a DBT device including a radiation source and a detector;
generating, by a processor, a projection image of the projection object based on the projection data;
pre-processing, by the processor, the projection image to generate a processed projection image;
reconstructing, by the processor, the processed projection image to generate a reconstructed image including an artifact; and
removing, by the processor, the artifact in the reconstructed image,
the pre-processing the projection image including segmenting the projection image to generate a segmented projection image; and
the artifact including a detector edge artifact relating to a detector edge, a projection object edge artifact relating to a projection object edge, and a serrated artifact, and the removing the artifact in the reconstructed image including:
removing the detector edge artifact;
removing the projection object edge artifact; and
removing the serrated artifact using a projection object template.

US Pat. No. 9,864,072

APPARATUS, METHOD AND SYSTEM FOR SPARSE DETECTOR

SHANGHAI UNITED IMAGING H...

1. An apparatus comprising:
a sparse detector, the sparse detector comprising:
an array of scintillator crystals generating scintillation in response to radiation, wherein the array of scintillator crystals
have a plurality of positions, a position is void or occupied by a scintillator crystal or a block of a light-transmitting
material, and the array of scintillator crystals are arranged according to a sparsity rule that at least a portion of scintillator
crystals of the array of scintillator crystals are spaced apart by one or more positions that are void or occupied by one
or more blocks of a light-transmitting material; and

an array of photodetector elements configured to generate an electrical signal in response to the scintillation, wherein at
least a portion of the array of photodetectors are coupled to the array of scintillator crystals; and

a processor configured to:
obtain imaging data from the sparse detector;
generate a plurality of virtual scintillator units according to the sparsity rule related to the sparse detector, wherein
a virtual scintillator unit corresponds to two or more neighboring positions of the array of scintillator crystals;

calculate efficiency of a line of response based on the plurality of virtual scintillator units; and
generate, based on the efficiency of the line of response and the imaging data, an image.

US Pat. No. 10,049,449

SYSTEM AND METHOD FOR IMAGE RECONSTRUCTION

SHANGHAI UNITED IMAGING H...

1. A system for image processing, the system comprising:a processor; and
a non-transitory computer readable storage medium storing computer-executable instructions that when executed cause the processor to perform operations comprising:
receiving first data of an object acquired at a first bed position and second data of the object acquired at a second bed position, the first bed position and the second bed position having an overlapping region corresponding to an overlapping portion of the object,
reconstructing a first image based on the first data;
reconstructing a second image based on the second data, wherein an overlapping ratio of the overlapping region with respect to the first image or the second image is from 0 to 1;
extracting third data corresponding to the overlapping region from the first data, wherein the third data correspond to the overlapping portion of the object;
extracting fourth data corresponding to the overlapping region from the second data, wherein the fourth data correspond to the overlapping portion of the object;
merging the third data and the fourth data to generate merged data corresponding to the overlapping portion of the object;
reconstructing a third image corresponding to the overlapping portion of the object based on the merged data; and
generating a fourth image through image composition based on the first image, the second image, and the third image, wherein a portion of the fourth image corresponding to the overlapping region is generated by performing weighted composition based on a first weight coefficient for the first image, a second weight coefficient for the second image, and a third weight coefficient for the third image.

US Pat. No. 9,835,701

DISPLACER IN MAGNETIC RESONANCE IMAGING SYSTEM

SHANGHAI UNITED IMAGING H...

1. A device comprising:
a first superconducting coil mounted on a first coil former, wherein the first coil former is at least partially accommodated
in a first housing;

a second superconducting coil mounted on a second coil former;
a first storage cavity at least partially defined by the first housing, the first coil former, and the second coil former,
wherein the storage cavity is configured to contain a volume of a first cryogen in the liquid state;

a displacer defining a first volume within the first storage cavity, wherein at least part of the displacer and at least part
of the first superconducting coil are immersed in the first cryogen in the liquid state; and

a second housing, wherein a first part of the second housing is outside of the first housing, and a second part of the second
housing is disposed through the displacer.

US Pat. No. 9,835,740

APPARATUS AND METHOD FOR PET DETECTOR

SHANGHAI UNITED IMAGING H...

1. A positron emission tomography (PET) detector, the PET detector comprising :
a crystal array comprising a plurality of crystal elements arranged in a single layer and a number of light-reflective films,
the light-reflective films being mounted on surfaces of the crystal elements; and

a semiconductor sensor array comprising a plurality of semiconductor sensors, the semiconductor sensors being configured to
be coupled with only a portion of crystal elements of the crystal array, wherein the number of the crystal elements of the
crystal array is more than the number of the semiconductor sensors of the semiconductor sensor array.

US Pat. No. 10,067,245

APPARATUS, METHOD AND SYSTEM FOR SPARSE DETECTOR

SHANGHAI UNITED IMAGING H...

1. An apparatus comprising one or more detector modules, at least one of the one or more detector modules comprising a sparse detector, the sparse detector comprising:an array of scintillator crystals generating scintillation in response to radiation, wherein the array of scintillator crystals have a plurality of positions, a position is void or occupied by a scintillator crystal or a block of a light-transmitting material, the array of scintillator crystals are sparsely arranged in two directions of the array of scintillator crystals according to at least a sparsity rule that at least a portion of scintillator crystals of the array of scintillator crystals are spaced apart by one or more positions that are void or occupied by one or more blocks of a light-transmitting material, and the sparse arrangement of the scintillator crystals of the sparse detector exhibits a random pattern in the two directions; and
an array of photodetector elements configured to generate electrical signals in response to the scintillation,
wherein at least a portion of the array of photodetector elements are coupled to the array of scintillator crystals, and
the electrical signals are output for generating imaging data.

US Pat. No. 9,990,718

SYSTEM AND METHOD FOR RECONSTRUCTING ECT IMAGE

SHANGHAI UNITED IMAGING H...

1. A method implemented on at least one machine each of which has at least one processor and storage, the method comprising:acquiring list mode data relating to a subject;
dividing the list mode data based on time information and/or spatial information;
establishing a relationship between data-space and reconstruction space;
obtaining, based on the divided list mode data and the relationship, expectation information of rigid motion of subject without performing image reconstruction; and
determining, based on the expectation information, translation information and rotational information to detect the rigid motion of the subject.

US Pat. No. 9,715,023

DETECTOR IN AN IMAGING SYSTEM

SHANGHAI UNITED IMAGING H...

1. A method for evaluating a working condition of a photodetector of a detector in an imaging device comprising:
receiving radiation by the detector in response to which a plurality of single events occur;
generating, by the photodetector, an electronic signal relating to the plurality of single events, wherein the electronic
signal comprises time related information processed by a time-to-digital convertor (TDC) having multiple TDC channels;

determining a parameter of the electronic signal relating to the plurality of single events; and
evaluating the working condition of the photodetector based on the parameter and a threshold.

US Pat. No. 9,693,749

IMAGING SYSTEM CALIBRATION

SHANGHAI UNITED IMAGING H...

13. An imaging system comprising: an imaging source to emit radiation;
an image detector to receive the radiation and to generate images based on the received radiation; and
a processing unit configured to execute program code stored on a non-transitory computer readable medium to cause the system
to:

determine a first sub-matrix of a projection matrix, the projection matrix describing a geometrical relationship between points
of a three-dimensional coordinate system of the imaging system and points of a two-dimensional coordinate system of the image
detector;

determine a second sub-matrix of the projection matrix, where the first sub-matrix and the second sub-matrix comprise a decomposition
of the projection matrix;

convert a first point of the two-dimensional coordinate system to a first point of the three-dimensional coordinate system
based on the first sub-matrix and the second submatrix;

determine an updated first sub-matrix of an updated projection matrix according to a first calibration schedule, where the
updated projection matrix describes a second geometrical relationship between points of the three-dimensional coordinate system
and points of the two-dimensional coordinate system, and where the updated first sub-matrix and the second sub-matrix comprise
a decomposition of the updated projection matrix; and

convert a second point of the two-dimensional system to a second point of the three-dimensional coordinate system based on
the updated first sub-matrix and the second sub-matrix.

US Pat. No. 9,984,465

METHOD AND SYSTEM FOR ANALYZING BLOOD FLOW CONDITION

SHANGHAI UNITED IMAGING H...

1. A system, comprising:a storage device storing a set of instructions, and
at least one processor configured to communicate with the storage device, wherein when executing the set of instructions, the at least one processor is configured to cause the system to:
obtain a first image at a first time phase and a second image at a second time phase;
select a first vascular region from the first image, wherein the first vascular region comprises a blood vessel;
select a second vascular region from the second image, wherein the second vascular region comprises at least a part of the blood vessel;
generate a first vascular model, wherein the first vascular model corresponds to the first vascular region;
generate a second vascular model, wherein the second vascular model corresponds to the second vascular region;
set a boundary condition of the first vascular model and a boundary condition of the second vascular model;
determine a condition of the blood vessel of the first vascular model at the first time phase, according to the boundary condition of the first vascular model;
correlate, based on the condition of the blood vessel of the first vascular model at the first time phase, the first vascular model and the second vascular model; and
determine a condition of the blood vessel of the second vascular model at the second time phase, according to the correlation and the boundary condition of the second vascular model.

US Pat. No. 9,974,980

RADIATION THERAPY SYSTEM

SHANGHAI UNITED IMAGING H...

1. An apparatus, comprising:a base;
a cylindrical gantry peripherally and rotatably supported on the base;
a first medical device assembly fixed to a first side of the gantry;
a cylinder fixed to a second side of the gantry, the gantry disposed between the first medical device and the cylinder;
a drag chain carrier, comprising a carrier body surrounding the cylinder and defining an annular track;
a drag chain, arranged within the annular track, wherein a first end of the drag chain is fixed to the cylinder and a second end is fixed to the cylindrical carrier body; and
a cable supported by the drag chain, wherein a first end of the cable is electrically connected to the first medical device assembly,
wherein the first medical device assembly includes a radiation therapy assembly.

US Pat. No. 9,875,558

IMAGE RECONSTRUCTION SYSTEM AND METHOD

SHANGHAI UNITED IMAGING H...

1. A method comprising:
obtaining a projection image of a projection object;
pre-processing, by a processor, the projection image acquired by an imaging device to generate a processed projection image,
the imaging device including a radiation source and a detector;

reconstructing, by the processor, the processed projection image to generate a reconstructed image including an artifact;
and

removing, by the processor, the artifact in the reconstructed image,
the pre-processing the projection image including segmenting the projection image to generate a segmented projection image,
the segmented projection image including a region of interest, and the segmenting the projection image including

determining an average gray value of one or more pixels of the projection image;
for each pixel of the one or more pixels of the projection image, assigning mark A or mark B to the pixel based on a relationship
between a gray value of the pixel and the average gray value; and

determining a boundary of the region of interest based on the assigned mark of each pixel of the one or more pixels of the
projection image,

the reconstructing the processed projection image to generate the reconstructed image including
filtering the processed projection image to generate a filtered projection image including a highlighted artifact and an X-ray
attenuation artifact;

correcting the highlighted artifact and the X-ray attenuation artifact in the filtered projection image to generate a first
image; and

performing back projection to generate the reconstructed image based on the first image.

US Pat. No. 9,824,503

SYSTEM AND METHOD FOR IMAGE COMPOSITION

SHANGHAI UNITED IMAGING H...

1. A method implemented on at least one device each of which has at least one processor and storage, the method comprising:
retrieving a first sub-image and a second sub-image; the first sub-image corresponding to a first set of 3D volume data, and
the second sub-image corresponding to a second set of 3D volume data;

retrieving a first overlapping image from the first sub-image;
retrieving a second overlapping image from the second sub-image;
generating a first 2D projection image and a first pixel map based on maximum intensity projection of the first overlapping
image onto a plane;

generating a second 2D projection image and a second pixel map based on maximum intensity projection of the second overlapping
image onto the plane;

performing 2D registration based on the first 2D projection image, the first pixel map, the second 2D projection image, and
the second pixel map;

performing 3D registration based on the 2D registration, the first pixel map, or the second pixel map;
identifying a correlation between of the first sub-image including the first overlapping image and the second sub-image including
the second overlapping image based on the 2D registration or the 3D registration; and

fusing the first overlapping image and the second overlapping image based on the correlation to provide a composite image.

US Pat. No. 9,974,496

RADIATION THERAPY POSITIONING SYSTEM

SHANGHAI UNITED IMAGING H...

1. A support apparatus, comprising:a base;
a support assembly, comprising:
a first support rotatably mounted to the base;
a second support movably mounted to the first support to move along a first horizontal direction;
a third support,
a height adjustment mechanism disposed between the second support and the third support such that the height of the third support with respect to the second support is adjustable; and
a fourth support movably mounted to the third support to move along a second horizontal direction perpendicular to the first horizontal direction; and
a patient support, movably mounted to the fourth support to move along the first horizontal direction.

US Pat. No. 9,784,814

METHOD AND SYSTEM FOR MEASURING AND CALIBRATING IMAGING MAGNETIC FIELD IN MAGNETIC RESONANCE APPARATUS

SHANGHAI UNITED IMAGING H...

1. An MRI method for measuring and calibrating an imaging magnetic field in a magnetic resonance apparatus connected to a
computer, comprising:
providing the imaging magnetic field including a main imaging magnetic field and a gradient magnetic field, where the imaging
magnetic field is configured to scan an object to be imaged;

sampling, by a probe, a signal corresponding to the imaging magnetic field;
processing, by the computer, the signal to obtain an actual magnetic field intensity;
obtaining, by the computer, an imaging magnetic field calibration value based on a difference between the actual magnetic
field intensity and the target magnetic field intensity;

obtaining, by the computer, a current calibration value of the magnetic component according to the imaging magnetic field
calibration value; and

calibrating, by the computer, the imaging magnetic field provided by the magnetic component based on the current calibration
value of the magnetic component, where the difference between the actual magnetic field intensity and the target magnetic
field intensity is divided into a uniform deviation, a linear deviation and a high-order deviation after calculation.

US Pat. No. 10,176,604

SYSTEM AND METHOD FOR IMAGE RECONSTRUCTION

SHANGHAI UNITED IMAGING H...

1. A method comprising:obtaining raw data corresponding to radiation rays within a volume;
determining, among the radiation rays, a first radiation ray passing a plurality of voxels corresponding to the volume based on the raw data;
grouping the voxels into a plurality of subsets;
loading the plurality of subsets of voxels into a memory such that at least some subsets of voxels along the first radiation ray are neighboring each other in the memory; and
performing a calculation relating to the loaded subsets of voxels by a plurality of processing threads in a parallel hardware architecture, wherein each of the plurality of processing threads corresponds to one of the loaded subsets of voxels, and at least two neighboring subsets of voxels in the memory are accessed by neighboring processing threads in the parallel hardware architecture in the calculation; and
reconstructing, based on the calculation relating to the loaded subsets of voxels, an image of the volume.

US Pat. No. 10,043,280

METHOD AND SYSTEM FOR IMAGE SEGMENTATION

SHANGHAI UNITED IMAGING H...

1. A method implemented on a computer including a storage device and a processor for segmenting an image, the method comprising:obtaining, by the processor, a lung model;
obtaining, by the processor, a chest image including a lung;
pre-processing, by the processor, the chest image;
acquiring, by the processor, a binary image including a boundary of the lung based on the preprocessed chest image;
performing, by the processor, generalized Hough transform on the binary image to locate an initial boundary of the lung in the chest image to obtain a Hough location of the lung;
aligning, by the processor, the lung model to the Hough location of the lung to obtain an alignment result;
applying, by the processor, a dynamic programming algorithm to the alignment result to obtain a segmentation result; and
transforming, by the processor, the segmentation result back to a coordinate system of the chest image,
wherein the lung model is obtained by the processor by:
obtaining a training set, wherein the training set includes a plurality of chest image samples;
selecting a first chest image sample from the training set;
acquiring a first lung contour in the first chest image sample;
selecting a plurality of the second chest image samples from the training set;
acquiring a plurality of second lung contours, a second lung contour corresponding to a second chest image;
processing the plurality of second lung contours to obtain transformed second lung contours;
aligning the transformed second lung contours with the first lung contour;
determining an average lung contour;
determining a difference between the average lung contour and the first lung contour;
comparing the difference with a threshold;
determining that the difference is smaller than the threshold to obtain a first determination result; and
designating, based on the first determination result, the average lung contour as the lung model.

US Pat. No. 9,928,437

METHOD AND SYSTEM FOR CRYSTAL IDENTIFICATION

SHANGHAI UNITED IMAGING H...

1. A method comprising:receiving a flood histogram relating to a subject;
determining a crystal central position map based on the flood histogram, the crystal central position map comprising a plurality of crystal central positions;
forming rows and columns of the plurality of crystal central positions to generate a labelled crystal central position map;
forming a template based on the rows and the columns in the labelled crystal central position map; and
correcting the labelled crystal central position map based on the template to obtain a corrected crystal central position map.

US Pat. No. 9,760,983

SYSTEM AND METHOD FOR IMAGE REGISTRATION IN MEDICAL IMAGING SYSTEM

SHANGHAI UNITED IMAGING H...

1. A method comprising:
designating a first image of an object as a reference image, the reference image comprising at least a reference feature point
and a reference structure;

obtaining a second image of the object, the second image comprising a feature point and a structure, the feature point corresponding
to the reference feature point of the reference image, the structure corresponding to the reference structure of the reference
image;

performing a first registration of the second image to obtain a first registered image, the first registration comprising
an affine transformation, the first registered image comprising the feature point and the structure;

performing a second registration of the first registered image to obtain a second registered image, the second registration
comprising aligning the structure in the first registered image with the reference structure in the reference image, the second
registered image comprising the feature point;

performing a third registration of the second registered image to obtain a third registered image, the third registration
comprising aligning the feature point in the second registered image with the reference feature point in the reference image;
and

subtracting the third registered image from the reference image to obtain a subtraction image comprising the feature point
or the structure.

US Pat. No. 10,255,696

SYSTEM AND METHOD FOR IMAGE RECONSTRUCTION

SHANGHAI UNITED IMAGING H...

1. A method implemented on at least one device each of which has at least one processor and storage, the method comprising:receiving raw data relating to a subject;
during each of a plurality of iterations,
calculating first voxel values within a first voxel, second voxel values within a second voxel and third voxel values within a third voxel at each successive iteration based on an image obtained from a prior iteration, wherein the first voxel is adjacent to and shares a first common boundary with the second voxel along a first direction, the first voxel is adjacent to and shares a second common boundary with the third voxel along a second direction, the first voxel values include at least two different first values, the second voxel values include at least two different second values, and the third voxel values include at least two different third values, and wherein a first voxel value at the first common boundary is equal to a second voxel value at the first common boundary, and a first voxel value at the second common boundary is different from a third voxel value at the second common boundary;
transforming the image to a projection domain to generate an estimated projection based on the first voxel values and the second voxel values;
generating a projection error based on the estimated projection and the raw data; and
generating an image based on the projection error to be used in a next iteration; and
obtaining, based on the plurality of iterations, a reconstructed image.

US Pat. No. 10,203,393

SYSTEM AND METHOD FOR REMOVING GIBBS ARTIFACT IN MEDICAL IMAGING SYSTEM

SHANGHAI UNITED IMAGING H...

1. A method of image processing comprising:setting k-space comprising a first part and a second part, wherein the first part is divided into a first region and a second region;
filling, in the first part of the k-space, a matrix comprising data;
applying a filter on the matrix in the first part to produce a filtered data matrix in the first part;
padding the second part of the k-space with padded data;
performing, based on a constraint, a plurality of iterations of an objective function for a target array in image domain, wherein the objective function is based on a total variation of the target array, and wherein the constraint is given by setting filtered data in the second region of the first part of the k-space to be invariant during the plurality of iterations, or a changing extent of filtered data in the second region be less than a changing extent of filtered data in the first region during the plurality of iterations; and
reconstructing an image based on the target array.

US Pat. No. 10,185,012

SYSTEM AND METHOD FOR MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. A method for magnetic resonance imaging implemented on at least one device each of which has at least one processor and storage, the method comprising:acquiring a plurality of echo signals relating to a region of interest of a subject at a number of echo times, each echo signal corresponding to an echo time;
generating a plurality of phase images based on the plurality of echo signals, each phase image corresponding to an echo signal;
generating an unwrapped phase map by performing a phase unwrapping correction to the plurality of phase images;
generating a virtual phase map based on the unwrapped phase map, the virtual phase map comprising at least a virtual phase corresponding to a virtual echo time;
determining a phase mask based on the virtual phase map;
obtaining magnitude information of the plurality of echo signals; and
generating a susceptibility weighted image based on the phase mask and the magnitude information.

US Pat. No. 10,168,401

RADIO-FREQUENCY COIL ASSEMBLY FOR MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. A radio frequency (RF) coil assembly, comprising: one or more coil elements arranged on a shell, a cable connector electrically connected to the coil elements, and a rotational device, the cable connector including a cable and a connector, the cable having a number of inner wires enclosed with an outer insulative jacket, and the cable having a first end connected to the connector and a second end connected to the shell via the rotational device.

US Pat. No. 10,002,447

SYSTEM AND METHOD FOR COMPUTED TOMOGRAPHY

SHANGHAI UNITED IMAGING H...

1. A method implemented on a computing device having at least one processor and at least one computer-readable storage medium, the method comprising:receiving a first set of raw data relating to a subject generated by an imaging device;
determining a first ROI in a field of view (FOV) of the imaging device;
determining a second ROI including the first ROI;
reconstructing the first set of raw data to obtain a first image on the second ROI;
obtaining a second image by zero padding the first ROI of the first image;
performing forward projection on the first image to obtain a first sinogram;
performing forward projection on the second image to obtain a second sinogram;
applying a first filter on the first sinogram to obtain a third sonogram;
subtracting the second sinogram from the third sinogram to obtain a fourth sinogram;
applying a second filter on the first set of raw data to obtain a fifth sinogram; and
performing, based on the fourth sinogram and the fifth sinogram, iterative reconstruction to generate a third image.

US Pat. No. 9,899,142

METHOD AND DEVICE FOR INSULATION OF HIGH-VOLTAGE GENERATOR TANK

SHANGHAI UNITED IMAGING H...

1. A transformer for a high-voltage generator tank, comprising:
an inner insulating bushing;
an outer insulating bushing outside the inner insulating bushing;
more than one PCB, configured in a stack structure, outside the outer insulating bushing;
at least one first oil barrier set on upper and lower surfaces of the stack structure of the more than one PCB:
a low-voltage winding wound on the inner insulating bushing;
a high-voltage winding wound on the more than one PCB;
an iron core going through the inner insulating bushings; and
a sampling board;
wherein the more than one PCB go through the outer insulating bushing and are located outside the outer insulating bushing,
and one end of the stack structure of the more than one PCB is connected with the at least one first oil barrier, and the
other end is connected with the sampling board.

US Pat. No. 10,455,678

SYSTEMS AND METHODS FOR X-RAY IMAGING

SHANGHAI UNITED IMAGING H...

1. An imaging device, comprising:a cathode configured to generate an electron beam;
an anode including a rotating target, the rotating target having a focal track and configured to rotate around an axis along a direction, the anode configured to generate X-rays in response to the electron beam impinging on the focal track of the rotating target; and
a deflection device configured to:
deflect the electron beam onto a first region of the focal track at a first time; and
deflect the electron beam onto a second region of the focal track at a second time, wherein the first region of the focal track is separated from the second region of the focal track, and a distance between the first region of the focal track and the second region of the focal track along the direction is a half integer multiple of a dimension of a detector cell that is configured to detect the X-rays.

US Pat. No. 10,181,191

METHODS AND SYSTEMS FOR IDENTIFYING SPINE OR BONE REGIONS IN COMPUTED TOMOGRAPHY IMAGE SEQUENCE

SHANGHAI UNITED IMAGING H...

1. A method for Computed Tomography (CT) image processing, comprising:a) retrieving a CT image sequence and segmenting a plurality of bone regions of the CT image sequence, the CT image sequence including one or more image slices;
b) in each image slice of the CT image sequence, determining a bone region with the maximum area among the plurality of bone regions as a spine region;
c) in each image slice of the CT image sequence, determining at least one anchor point in the top row of the spine region, and validating the at least one anchor point based on information associated with a position of the at least one anchor point in the image slice; and
d) calibrating the at least one anchor point based on the validation result,
wherein the validating the at least one anchor point comprises:
determining a y coordinate of the at least one anchor point is greater than ¼ of the height of the image slice of the CT image sequence, and a shift of an x coordinate from the central position is less than ¼ of a width of the image slice of the CT image sequence; and
determining that the at least one anchor point is valid.

US Pat. No. 10,176,393

METHOD AND SYSTEM FOR CRYSTAL IDENTIFICATION

SHANGHAI UNITED IMAGING H...

1. A method implemented on at least one machine each of which has at least one processor and a storage device, comprising:receiving a flood histogram I relating to a subject;
performing a zero-one normalization on the flood histogram I to generate a normalized flood histogram I0;
performing K iterations of treatment on the normalized flood histogram I0 to generate a series of intermediate flood histogram Ii, 1iK;
generating a series of binary image Bi, 1iK, based on the series of intermediate flood histogram Ii, respectively; and
generating a crystal central position map (CCPM) based on the series of binary image Bi.

US Pat. No. 10,166,407

SYSTEM AND METHOD FOR COUCH SAG COMPENSATION IN IMAGE GUIDED RADIO THERAPY

SHANGHAI UNITED IMAGING H...

1. A method for using in a two-modality apparatus, wherein the two-modality apparatus comprises a couch with a table top, a first modality unit having a first isocenter, a second modality unit having a second isocenter, the method comprising:acquiring an image of a target portion of the object when the table top is at a second working position of the second modality unit;
determining a second sag of the table top at a second measurement point of the table top according to the image, the second measurement point of the table top relating to the second isocenter of the second modality unit;
retrieving standard data that provide a relationship relating to a sag of the table top positioned between the first modality unit and second modality unit; and
estimating, based on the second sag and the standard data, a first sag of the table top at a first measurement point of the table top when the table top carrying an object is at a first working position of the first modality unit, the first measurement point of the table top relating to the first isocenter of the first modality unit.

US Pat. No. 10,210,634

SYSTEM AND METHOD FOR SEGMENTING MEDICAL IMAGE

SHANGHAI UNITED IMAGING H...

1. A method for segmenting a medical image, comprising:acquiring magnetic resonance (MR) data obtained in a scan of an object using an MR scanner;
reconstructing an MR image using the MR data, wherein the MR image comprises a plurality of voxels;
acquiring positron emission tomography (PET) data obtained in a scan of the object using a PET scanner;
segmenting the MR image into a plurality of regions that include at least one air/bone ambiguous region, wherein the air/bone ambiguous region includes air voxels and bone voxels undistinguished from each other;
generating an initial attenuation map by assigning attenuation coefficients to the voxels of the plurality of regions in the segmented MR image, wherein the voxels of the at least one air/bone ambiguous region are assigned at least one specific attenuation coefficient without differentiating voxels corresponding to air and voxels corresponding to bone in the at least one air/bone ambiguous region;
generating a PET image and an estimated attenuation map by performing, based on the PET data and the initial attenuation map, iterative reconstruction;
reassigning attenuation coefficients to the voxels of the air/bone ambiguous region based on the estimated attenuation map; and
distinguishing the bone voxels and the air voxels in the air/bone ambiguous region based on the reassigned attenuation coefficients.

US Pat. No. 10,178,976

METHOD AND APPARATUS FOR TEMPERATURE CONTROL IN A PET DETECTOR

SHANGHAI UNITED IMAGING H...

1. A positron emission tomography (PET) and magnetic resonance (MR) hybrid imaging system comprising a magnetic resonance imaging (MRI) module and a PET module, the MRI module being configured to generate a magnetic field along a direction, the PET module including a heat exchange plate, the heat exchange plate comprising a fluidic passage and a plate, the plate having a cross-section that is perpendicular to the direction of the magnetic field,wherein the fluidic passage is configured to contain a flow of a heat exchange-medium, and the fluidic passage is arranged within a plane that is parallel to the direction of the magnetic field; and
wherein the plate comprises at least one slot dividing the cross-section of the plate into a plurality of segments that are electrically insulating to each other.

US Pat. No. 10,346,993

SYSTEMS AND METHODS FOR IMAGE PROCESSING IN MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. A method comprising:obtaining an MR image including a plurality of slice images, the plurality of slice images including a myocardium of a left ventricle, each of the plurality of slice images including one or more images obtained in one or more cardiac cycles;
for each slice image of the plurality of slice images, determining a reference image by selecting from the one or more images of the each slice image according to a blood pool area in at least one of the one or more images;
determining an endocardial boundary of the myocardium for the each slice image of the plurality of slice images;
registering the each slice image of the plurality of slice images according to the corresponding reference image; and
determining an epicardial boundary of the myocardium in the each registered slice image of the plurality of registered slice images according to the endocardial boundary of the myocardium in the each slice image of the plurality of slice images.

US Pat. No. 10,345,460

POSITRON EMISSION TOMOGRAPHY IMAGING SYSTEM

SHANGHAI UNITED IMAGING H...

1. A positron emission tomography (PET) imaging system comprising:a gantry forming a detection tunnel;
a detector mounted to the gantry, and positioned in a circumference of the detection tunnel;
a connector configured to mount the detector to the gantry;
a heat transfer device being mounted on the connector and thermally coupled with the detector and configured to transfer heat generated by the detector; and
a cooling device thermally coupled to the heat transfer device, and configured to cool the heat transfer device, wherein:
the connector includes a fixing unit configured to fix the detector on the gantry and a supporting unit configured to support the detector, the supporting unit having a first surface and a second surface,
the second surface of the supporting unit further comprises a concave region, and
the concave region of the second surface of the supporting unit comprises a first groove configured to accommodate at least a part of the heat transfer device.

US Pat. No. 10,290,109

METHOD AND SYSTEM FOR CARDIAC IMAGE SEGMENTATION

SHANGHAI UNITED IMAGING H...

1. A method for cardiac image segmentation, implemented on at least one machine each of which has at least one processor and storage, the method comprising:obtaining a plurality of slice images of a myocardium of a left ventricle at a plurality of time phases in a cardiac cycle;
determining, based on at least one of the plurality of slice images, an end-diastolic phase from the plurality of time phases;
retrieving, from the plurality of slice images, a first slice image at the end-diastolic phase and a second slice image at the end-diastolic phase, wherein the first slice image at the end-diastolic phase includes a mid-ventricular slice image at the end-diastolic phase and the second slice image at the end-diastolic phase is different from the first slice image at the end-diastolic phase;
obtaining a region of interest in the first slice image at the end-diastolic phase and a region of interest in the second slice image at the end-diastolic phase;
segmenting a blood pool region in the region of interest in the first slice image at the end-diastolic phase;
using the segmentation of the blood pool region in the region of interest in the first slice image at the end-diastolic phase as guidance for segmenting a blood pool region in the region of interest in the second slice image at the end-diastolic phase;
transforming the region of interest in the first slice image at the end-diastolic phase into a polar coordinate image;
performing a dual dynamic programming operation on the polar coordinate image to determine endocardial and epicardial boundaries of the myocardium in the polar coordinate image by selecting points with a minimum accumulated cost in the polar coordinate image to find optimal paths representing the endocardial and epicardial boundaries of the myocardium in the polar coordinate image; and
transforming the polar coordinate image into a Cartesian coordinate image to obtain the endocardial and epicardial boundaries of the myocardium in the first slice image at the end-diastolic phase.

US Pat. No. 10,261,158

METHOD AND APPARATUS FOR ELIMINATING MOTION ARTIFACT IN MAGNETIC RESONANCE IMAGING

Shanghai United Imaging H...

1. A method for eliminating motion artifacts in magnetic resonance imaging, comprising the following steps:1) obtaining fully-sampled initial K-space data corresponding to a plurality of channels;
2) calculating combination coefficients based on the fully-sampled initial K-space data and obtaining K1-space data based on the combination coefficients;
3) obtaining K2-space data based on the initial K-space data and the K1-space data, obtaining a S2 image by transforming the K2-space data to an image domain, obtaining a S2? image by extracting part of the errors caused during the step of obtaining the K1-space data;
4) obtaining K3-space data by transforming the S2? image to K-space domain, obtaining K4-space data based on the K3-space data and the K1-space data;
wherein an iteration operation is defined as including steps 2)-4);
5) determining whether to perform a next iteration operation; making the K4-space data new initial K-space data, if a next iteration is determined to be performed, and returning to step 2);
6) obtaining a final image by transforming the K4-space data to the image domain;
wherein obtaining K2-space data based on the initial K-space data and the K1-space data comprises obtaining K2-space data by subtracting the initial K-space data from the K1-space data.

US Pat. No. 10,249,066

SYSTEM AND METHOD FOR MPR STREAK REDUCTION

SHANGHAI UNITED IMAGING H...

1. A system comprising:at least one processor, and
instructions that, when executed by the at least one processor, cause the at least one processor to effectuate a method comprising:
receiving image data;
retrieving a first image volume from the image data, the first image volume including a plurality of images, at least one image of the plurality of images including a streak artifact of having a streak width along a first direction;
down sampling the first image volume along the first direction at an image increment equal to the streak width to generate a second image volume;
equalizing the second image volume along a second direction to generate a third image volume;
up sampling the third image volume along the first direction to generate a fourth image volume;
determining an error image volume based on the fourth image volume and the first image volume, the error image volume including one or more error images;
correcting the first image volume with the error image volume to generate corrected image volume.

US Pat. No. 10,462,888

SYSTEMS AND METHODS FOR DETERMINING A POSITION OF A FOCAL SPOT OF AN X-RAY SOURCE

SHANGHAI UNITED IMAGING H...

1. A system for determining a position of a focal spot of an X-ray source, comprising:a tracking device radiated by the X-ray source, the tracking device including:
a shelter configured to attenuate X-rays emitted from the focal spot of the X-ray source; and
an X-ray receiver including a plurality of X-ray receiving regions configured to receive X-rays, at least one of the plurality of X-ray receiving regions receiving X-rays that include attenuated X-rays by the shelter and unattenuated X-rays, wherein the shelter and the X-ray receiver are separated by a distance.

US Pat. No. 10,434,334

METHODS AND SYSTEMS FOR IRRADIATION BASED ON A FLUENCE MAP

SHANGHAI UNITED IMAGING H...

1. A method, comprising:determining a shield type of each of a plurality of rows of a fluence map wherein one or more of the plurality of rows are shield by a jaw;
determining a movement curve for each of the plurality of rows, the movement curve indicating a relationship between an irradiation dose in the each of the plurality of rows and a moving position of a leaf pair corresponding to the each of the plurality of rows;
determining an initial irradiation dose for each of the movement curves;
synchronizing one of the movement curves based on the shield types of the plurality of rows;
selecting at least one irradiation dose of at least one point on an irradiation dose axis; and
generating a control point according to the selected irradiation dose.

US Pat. No. 10,426,416

SYSTEM AND METHOD FOR DIGITAL RADIOGRAPHY

SHANGHAI UNITED IMAGING H...

1. A digital radiography system comprising an X-ray generation module, an X-ray acquisition module, a support module, a power supply module and a control module,wherein one or more of said modules comprise at least one moving component, said at least one moving component comprising a sensing unit,
wherein the sensing unit is configured to obtain positional information of the at least one moving component, and
wherein the control module is configured to control motion of the at least one moving component based on said positional information, said control module comprising a setting unit, a position unit, and a calculation unit, wherein
the setting unit is configured to set a target position for the at least one moving component;
the position unit is configured to obtain an instant position of the at least one moving component and an instant position of at least one obstacle; and
the calculation unit is configured to calculate all axial speeds for the at least one moving component, when the instant position of the at least one moving component is different from the target position, wherein the calculation unit calculates the axial speeds by
determining a first collision area for the at least one moving component and a second collision area for the at least one obstacle;
calculating a repulsive force by the at least one obstacle;
calculating an attractive force by the target position;
calculating a net force of the attractive force and the repulsive force; and
determining all axial speeds for the at least one moving component.

US Pat. No. 10,373,351

IMAGE RECONSTRUCTION SYSTEM AND METHOD IN MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. A method for reconstructing a corrected image implemented on a magnetic resonance imaging (MRI) system including an MRI device and a computing device, the MRI device including multiple radio frequency (RF) receiver coils, the computing device including a processor, the method comprising:receiving, by the multiple RF receiver coils, MR signals of an object;
generating, by the processor, multiple coil images of the object based on the MR signals, the multiple coil images including a first set of coil images and a second set of coil images;
reconstructing, by the processor, a first reconstructed image based on the first set of coil images according to a first reconstruction algorithm;
reconstructing, by the processor, a second reconstructed image based on the second set of coil images according to a second reconstruction algorithm, the second reconstruction algorithm being different with the first reconstruction algorithm;
generating, by the processor, correction information about the first reconstructed image by dividing the first reconstructed image by the second reconstructed image; and
generating, by the processor, the corrected image with reduced inhomogeneity intensity based on the first reconstructed image and the correction information about the first reconstructed image.

US Pat. No. 10,347,014

SYSTEM AND METHOD FOR IMAGE RECONSTRUCTION

SHANGHAI UNITED IMAGING H...

1. An image reconstruction method for an imaging system, the method being implemented on a computing device having one or more processors and one or more storage media, the method comprising:determining a first region of an object, the first region corresponding to a first voxels of a first voxel size;
determining a second region of the object, the second region corresponding to second voxels of a second voxel size, the first voxel size being different from the second voxel size;
acquiring, using the imaging system, scan data of the object including both the first region of the object and the second region of the object;
reconstructing a first regional image of the first region based on the scan data, wherein the reconstructing a first regional image includes:
determining a first image matrix corresponding to the first region, the first image matrix including first elements corresponding to the first voxels;
determining a second image matrix corresponding to the second region, the second image matrix including second elements corresponding to the second voxels;
performing a forward projection on the first elements corresponding to the first voxels and the second elements corresponding to the second voxels to generate projection data; and
performing a back projection on the projection data corresponding to the first voxels, and
simultaneously reconstructing a second regional image of the second region based on the scan data, wherein the reconstructing a second regional image further includes:
performing a back projection on the projection data corresponding to the second voxels.

US Pat. No. 10,325,369

METHOD AND SYSTEM FOR ANALYZING BLOOD FLOW CONDITION

SHANGHAI UNITED IMAGING H...

1. A system, comprising:a storage device including a set of instructions for analyzing blood flow conditions; and
at least one processor in communication with the storage device, wherein when executing the set of instructions, the at least one processor is configured to cause the system to:
obtain vascular images at multiple time phases, including a first vascular image at a first time phase and a second vascular image at a second time phase, wherein the vascular images at multiple time phases correspond to a same blood vessel or a part thereof;
generate multiple vascular models, wherein the multiple vascular models correspond to the vascular images at multiple time phases;
obtain, according to the multiple vascular models, multiple conditions of the blood vessel or the part thereof including a first vascular condition and a second vascular condition, wherein the first vascular condition corresponds to the first vascular image, and the second vascular condition corresponds to the second vascular image;
determine, according to the multiple conditions of the blood vessel or the part thereof, a relationship between condition of the blood vessel or the part thereof and time phase; and
obtain, according to the relationship, a third vascular condition of the blood vessel or the part thereof at a third time phase.

US Pat. No. 10,311,604

SYSTEM AND METHOD FOR GENERATING ATTENUATION MAP

SHANGHAI UNITED IMAGING H...

12. A method of image reconstruction for positron emission tomography (PET) comprising:acquiring PET data indicative of a subject;
acquiring a PET image by reconstructing the PET data, wherein the PET data is attenuation corrected by an attenuation map, wherein the attenuation map is generated by following steps:
acquiring an MR image indicative of the subject, wherein the MR image comprises a plurality of voxels;
fetching a reference image from a database, wherein the reference image comprises voxel segmentation information;
registering the reference image to the MR image;
segmenting the MR image into a plurality of regions based on the voxel segmentation information of the reference image;
generating a first attenuation map corresponding to the MR image by assigning attenuation coefficients stored in the database to the plurality of regions of the MR image;
for a voxel of the plurality of voxels of the MR image,
determining a three-dimensional (3D) region in the MR image, wherein the voxel is the center of the 3D region;
calculating a registration accuracy of the 3D region between the MR image and the reference image;
determining a probability distribution of attenuation coefficient of the voxel based on the registration accuracy;
updating the PET data based on the first attenuation map and generating a first PET image; and
updating the first attenuation map based on the probability distribution of attenuation coefficient and the PET data of the first PET image to obtain a second attenuation map.

US Pat. No. 10,297,024

SYSTEM AND METHOD FOR DETERMINING A BREAST REGION IN A MEDICAL IMAGE

SHANGHAI UNITED IMAGING H...

1. A method implemented on at least one device each of which has at least one processor and storage, the method comprising:obtaining a first image including a breast region, the breast region including a first region and a second region;
determining the first region in the breast region, the first region including a first plurality of pixels;
performing a pretreatment on the first image to obtain a pretreated first image, wherein the pretreated first image includes the first plurality of pixels corresponding to a first average gray value, a second plurality of pixels in the second region corresponding to a second average gray value, and a third plurality of pixels in a third region relating to a background region corresponding to a third average gray value, the first average gray value being greater than the third average gray value and smaller than the second average gray value;
determining the second region relating to an edge of the breast region based on the pretreated first image, the second plurality of pixels including at least a portion of the first plurality of pixels; and
determining the breast region based on the first region and the second region.

US Pat. No. 10,290,108

METHODS AND SYSTEMS FOR IMAGE PROCESSING

SHANGHAI UNITED IMAGING H...

1. An image processing method implemented on at least one machine each of which has at least one processor and storage, the method comprising:acquiring a target image, the target image including a plurality of elements, an element corresponding to a pixel or a voxel, the target image being generated by an imaging device;
decomposing, by a first decomposition algorithm, the target image into L layers, each layer of the L layers including a low frequency sub-image and a high frequency sub-image, L?1;
decomposing, by a second decomposition algorithm, the target image into L?+N layers, each layer of the L?+N layers including a low frequency sub-image and a high frequency sub-image, L??1, and N?1, the second decomposition algorithm being different from the first decomposition algorithm;
transforming at least one layer, the at least one layer including the Lth layer generated by the first decomposition algorithm or the L?th layer generated by the second decomposition algorithm;
updating the low frequency sub-image of the Lth layer generated by the first decomposition algorithm by replacing the low frequency sub-image of the Lth layer generated by the first decomposition algorithm with the low frequency sub-image of the L?th layer generated by the second decomposition algorithm; and
reconstructing, based on the high frequency sub-images of the L layers generated by the first decomposition algorithm, the updated low frequency sub-image of the Lth layer generated by the first decomposition algorithm, and the at least one transformed layer, a composite image.

US Pat. No. 10,265,032

SYSTEMS AND METHODS FOR DATA COLLECTION IN A MEDICAL DEVICE

SHANGHAI UNITED IMAGING H...

1. A method comprising:identifying a channel including a data control panel and one or more detection components, wherein at least one of the one or more detection components is directly connected to the data control panel;
sending, by the data control panel, a configuration command to the one or more detection components;
sending, by the one or more detection components, one or more channel location numbers of the one or more detection components to the data control panel based on the configuration command;
determining, by the data control panel, one or more identification numbers for the one or more detection components based on the one or more channel location numbers;
allocating, by the data control panel, the one or more identification numbers to the one or more detection components;
identifying, by the one or more detection components, a type of a connection between the data control panel and the one or more detection components based on the one or more identification numbers; and
determining, by the one or more detection components, one or more time compensation signals for the one or more detection components based on the type of the connection.

US Pat. No. 10,267,930

SYSTEMS FOR PET IMAGING

SHANGHAI UNITED IMAGING H...

1. An imaging system, comprising:a detector assembly including a plurality of detector modules;
a gantry assembly including a main gantry and a gantry base, wherein the gantry base is configured to support the main gantry, and the detector assembly is mounted on the main gantry; and
a cooling assembly including a cooler, a chilling chamber surrounding the plurality of detector modules, an inlet chamber, and a return chamber, wherein the inlet chamber is in fluid communication with the chilling chamber, the return chamber is in fluid connection with the cooler, the inlet chamber and the return chamber have a common plane, and the common plane includes a first thermal insulation layer.

US Pat. No. 10,445,905

SYSTEM AND METHOD FOR IMAGE RECONSTRUCTION

SHANGHAI UNITED IMAGING H...

1. A method implemented on at least one computing device each of which has at least one processor and storage, the method comprising:retrieving raw data relating to a scanned portion of an object;
generating an image based on the raw data;
identifying a first voxel of the image, the first voxel corresponding to a first shadow range on at least one detector cell;
determining whether the first shadow range exceeds a first threshold;
in response to a determination that the first shadow range exceeds the first threshold, dividing the first voxel into a first number of sub-voxels; and
reconstructing the image using an iterative reconstruction process comprising a plurality of iterations, wherein during an iteration of the plurality of iterations,
a calculation relating to the first voxel is based on the first number of sub-voxels.

US Pat. No. 10,441,816

RADIATION THERAPY SYSTEM

SHANGHAI UNITED IMAGING H...

1. A radiation therapy apparatus, comprising:a base;
a cylinder-shaped gantry having a longitudinal axis along an axial direction of the gantry, wherein the gantry rotates around the longitudinal axis and is supported by the base;
a radiation therapy assembly, comprising an arm and a radiation head, wherein one end of the arm is fixed to a first position on a first side of the gantry and a second end of the arm is extended, and the radiation head is fixed to the second end of the arm;
an imaging assembly, mounted to a second side of the gantry opposite to the first side, and configured to be a first counterbalance to a weight of the radiation therapy assembly;
a second counterbalance, fixed to the second side of the gantry, and configured to cooperate with the imaging assembly to inhibit the gantry from tipping at least partially off the base.

US Pat. No. 10,433,810

IMAGING SYSTEM CALIBRATION

SHANGHAI UNITED IMAGING H...

20. A non-transitory computer readable medium storing instructions, the instructions, when executed by a computing device, causing the computing device to implement a method, the method comprising:determining a first sub-matrix of a projection matrix, the projection matrix describing a geometrical relationship between points of a three-dimensional (3D) coordinate system of the imaging system and points of a two-dimensional (2D) coordinate system of the image detector;
determining a second sub-matrix of the projection matrix, each of the first sub-matrix and the second sub-matrix including a decomposition of the projection matrix; and
converting a first point of the two-dimensional coordinate system of the imaging system to a first point of the three-dimensional coordinate system of the imaging system based on the first sub-matrix and the second sub-matrix.

US Pat. No. 10,429,477

SYSTEM AND METHOD FOR FLIP ANGLE DETERMINATION IN MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. A magnetic resonance imaging (MRI) system comprising: an MRI scanner, a control unit, and a processing unit,the processing unit performing operations comprising:
a) selecting an initial condition relating to a first phase of an echo train, the initial condition including initial values of a first flip angle, a last flip angle, and a first characteristic parameter;
b) providing a first function corresponding to the first phase echo train, the first function relating to at least one of the first flip angle, the last flip angle, or the first characteristic parameter;
c) calculating, based on the first function, one or more flip angles corresponding to one or more spin echoes of the first phase;
d) assessing the one or more flip angles of the first phase according to a first criterion; and
e) if the first criterion is not satisfied,
revising the first function by adjusting at least one of the first flip angle, the last flip angle, or the first characteristic parameter, and repeating (c) and (d);
wherein the first function provides a flip angle schedule corresponding to the first phase of the echo train for MRI, and
the control unit controlling the MRI scanner according to the flip angle schedule,
wherein the first function includes:

where ?0 is the first flip angle of the first phase, ?N-1 is the last flip angle of the first phase, N is a number of echoes in the first phase, P is the characteristic parameter of the first phase, ?n is the one or more flip angles of the first phase, n=0, 1, . . . , N?1;
where M=0 if ?N-1??0, or M=N?1 if ?0>?N-1.

US Pat. No. 10,416,263

SYSTEM AND METHOD FOR MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. An imaging method implemented on at least one machine each of which has at least one processor and storage, the method comprising:determining a scanning parameter of an imaging device, the scanning parameter comprising one or more predetermined values;
obtaining one or more MR signal sets acquired by the imaging device based on the one or more predetermined values of the scanning parameter, an MR signal set corresponding to a predetermined value of the one or more predetermined values;
generating one or more original images based on the one or more MR signal sets, an original image corresponding to an MR signal set of the one or more MR signal sets;
determining one or more virtual values of the scanning parameter, wherein the one or more virtual values are different from the one or more predetermined values; and
generating one or more virtual images based on the one or more virtual values and the one or more original images, a virtual image corresponding to a virtual value of the one or more virtual values of the scanning parameter.

US Pat. No. 10,415,759

CRYOSTAT FOR SUPERCONDUCTING MAGNET SYSTEM

SHANGHAI UNITED IMAGING H...

1. A cryostat comprising:an outer vessel;
an inner vessel suspended within the outer vessel;
a space defined by the inner vessel and the outer vessel, the space having an upper part and a lower part;
a plurality of first support elements comprising a first number of the first support elements located in the upper part of the space and a second number of the first support elements located in the lower part of the space, each of the plurality of first support elements having a first strength; and
a second support element having a second strength,
wherein
the first strength of at least one of the plurality of first support elements is different from the second strength of the second support element,
at least one of the first support elements located in a first part of the space is at a first oblique angle with an XY datum plane and at a second oblique angle with an XZ datum plane, and the first support elements located in a second part of the space are in the XY datum plane, the first part of the space being one of the lower part of the space or the upper part of the space, and the second part of the space being the other of the lower part of the space or the upper part of the space that is different from the first part,
an origin of a three-dimensional coordinate system coincides with a center of the inner vessel of the cryostat,
the three-dimensional coordinate system includes an X axis, a Y axis, and a Z axis that are perpendicular to each other and intersect at the origin,
the X axis is a horizontal axis,
the Y axis is a vertical axis,
the Z axis coincides with the longitudinal axis of the inner vessel,
the XY datum plane is defined by the X axis and the Y axis and perpendicular to the Z axis,
the XZ datum plane is defined by the X axis and the Z axis,
the inner vessel and the outer vessel are connected by two opposite ends of a first support element of the plurality of first support element,
the inner vessel and the outer vessel are connected by two opposite ends of the second support element, and
the first number is different from the second number.

US Pat. No. 10,408,908

SYSTEM AND METHOD FOR AN EDDY-CURRENT FIELD COMPENSATION IN MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. A method for calibrating an eddy-current, the method comprising:establishing an eddy-current field model, wherein the eddy-current field is expressed by Laplace transformation;
obtaining data of a first eddy-current field and using the established eddy-current field model to process the data of the first eddy-current field to obtain a first parameter;
fitting the established eddy-current field model with the data of the first eddy-current field and the first parameter to acquire a second parameter;
incorporating the second parameter into the established eddy-current field model to obtain a calibrated eddy-current field model; and
calibrating the eddy-current based on the calibrated eddy-current field model.

US Pat. No. 10,368,778

SYSTEM AND METHOD FOR FAST IMAGING IN MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. A method for generating a magnetic resonance (MR) image, the method comprising:generating a main magnetic field through a region of interest (ROI);
applying a slice selection gradient to a slice of the ROI;
applying a plurality of RF pulses to the slice of the ROI to generate a plurality of echoes;
applying a first encoding gradient in a first direction and simultaneously applying a second encoding gradient in a second direction on each echo, wherein an amplitude of the first encoding gradient is always positive or always negative during a process of acquiring each echo, an absolute value of the amplitude of the first encoding gradient for acquiring a center region of a k-space is lower than an absolute value of the amplitude of the first encoding gradient for acquiring a peripheral region of the k-space, and the second encoding gradient in the second direction comprises an oscillating waveform;
generating, based on the first encoding gradient in the first direction and the second encoding gradient in the second direction, a plurality of undersampled k-space data sets; and
generating an MR image by applying at least one image reconstruction method to the undersampled k-space data sets.

US Pat. No. 10,365,385

APPARATUS, METHOD AND SYSTEM FOR SPARSE DETECTOR

SHANGHAI UNITED IMAGING H...

1. An apparatus comprisinga sparse detector, the sparse detector comprising:
an array of scintillator crystals generating scintillation in response to radiation, at least a portion of the scintillator crystals being spaced apart according to at least one sparsity rule; and
an array of photodetector elements configured to generate an electrical signal in response to the scintillation,
wherein at least a portion of the array of photodetectors are coupled to the array of scintillator crystals, and
a processor configured to:
obtain imaging data from the sparse detector;
generate a plurality of virtual scintillator units according to the at least one sparsity rule related to the sparse detector;
calculate efficiencies of the virtual scintillator units;
calculate an efficiency of a line of response based on the efficiencies of the virtual scintillator units; and
generate, based on the efficiency of the line of response and the imaging data, an image.

US Pat. No. 10,340,075

METHOD AND DEVICE FOR INSULATION OF HIGH-VOLTAGE GENERATOR TANK

SHANGHAI UNITED IMAGING H...

1. A high-voltage generator tank, comprising:a tank with a tank lid, the tank lid having an opening; and
a bellows coupled to the tank, the bellows having a guide structure configured to lead the bellows to extend or shorten axially and fix the bellows,
wherein
the bellows comprises an opening having an open end and a closed end, wherein the open end of the opening of the bellows is fixed to the opening in the tank lid.

US Pat. No. 10,339,634

SYSTEM AND METHOD FOR IMAGE RECONSTRUCTION

SHANGHAI UNITED IMAGING H...

1. A method implemented on a computing device having at least one processor and a non-transitory storage medium for image reconstruction, the method comprising:receiving raw data relating to a subject;
generating a first image based on the raw data;
constructing a noise model that indicates a noise distribution of the first image;
generating a second image by reducing noise from the first image based on the noise model;
generating a third image by subtracting the second image from the first image, wherein the third image indicates the noise in the first image;
generating a fourth image by improving a luminance or color of at least a portion of the second image; and
generating a fifth image by combining the fourth image and the third image to add an amount of noise to the fourth image.

US Pat. No. 10,339,677

SYSTEMS AND METHODS FOR IMAGE DATA PROCESSING IN COMPUTERIZED TOMOGRAPHY

SHANGHAI UNITED IMAGING H...

1. A system, comprising:a scanner having a collimator, a collimation width of the collimator being adjustable;
one or more non-transitory storage devices including a set of instructions for image data processing; and
at least one processor configured to communicate with the one or more non-transitory storage devices, wherein when executing the set of instructions, the at least one processor is configured to cause the system to:
obtain a relationship between correction coefficients and collimation widths;
obtain a target collimation width of the collimator; and
determine a target correction coefficient based on the target collimation width and the relationship between correction coefficients and collimation widths, wherein to obtain the relationship between correction coefficients and collimation widths, the at least one processor is configured to cause the system to:
obtain a first correction coefficient, the first correction coefficient corresponding to a first collimation width of the collimator;
obtain a relationship between scattered radiation intensities and collimation widths; and
determine the relationship between correction coefficients and collimation widths based on the first correction coefficient, the first collimation width, and the relationship between scattered radiation intensities and collimation widths.

US Pat. No. 10,324,153

SYSTEM AND METHOD FOR FLIP ANGLE DETERMINATION IN MAGNETIC RESONANCE IMAGING

SHANGHAI UNITED IMAGING H...

1. A magnetic resonance imaging (MRI) system comprising:an MRI scanner, a control unit, and a processing unit, wherein
the processing unit is configured to determine a flip angle schedule corresponding to an echo train having a plurality of phases by performing operations comprising:
for each phase of the plurality of phases of the echo train,
a) determining an initial condition relating to the phase, the initial condition including initial values of a starting flip angle of the phase, an ending flip angle of the phase, a spin echo number of the phase, and a characteristic parameter of the phase;
b) determining a function corresponding to the phase, the function relating to the starting flip angle of the phase, the ending flip angle of the phase, the spin echo number of the phase, and the characteristic parameter of the phase;
c) calculating, based on the function, one or more flip angles corresponding to one or more spin echoes of the phase;
d) assessing the one or more flip angles of the phase according to a criterion; and
e) if the criterion is not satisfied, revising the function by adjusting at least one of the starting flip angle, the ending flip angle, the spin echo number, or the characteristic parameter, and repeating (c) and (d);
wherein the function provides a portion of the flip angle schedule corresponding to the phase of the echo train for MRI, and
the control unit is configured to control the MRI scanner according to the flip angle schedule,
wherein the function includes:

where ?0 is the starting flip angle of the phase, ?N?1 is the ending flip angle of the phase, N is the spin echo number of the phase, P is the characteristic parameter of the phase, ?n is the one or more flip angles of the phase, n=0, 1, . . . , N?1;
where M=0 if ?N?1??0, or M=N?1 if?0>?N?1.

US Pat. No. 10,295,645

METHOD AND SYSTEM FOR MEASURING AND CALIBRATING IMAGING MAGNETIC FIELD IN MAGNETIC RESONANCE APPARATUS

SHANGHAI UNITED IMAGING H...

1. A magnetic resonance imaging (MRI) system comprising:a magnetic component configured to provide an imaging magnetic field including a main imaging magnetic field and a gradient magnetic field;
a coil configured to provide a measurement radio frequency (RF) signal, the measurement RF signal stimulating a monitoring sample to generate at least one measurement magnetic resonance signal corresponding to the imaging magnetic field;
a plurality of probes configured to acquire the at least one measurement magnetic resonance signal corresponding to the imaging magnetic field; and
a computing device configured to:
establish a physical model based on the at least one measurement magnetic resonance signal;
predict an actual magnetic field intensity of the imaging magnetic field based on the physical model; and
obtain an image by performing image reconstruction according to data obtained under the actual magnetic field intensity of the imaging magnetic field in combination with a difference between the actual magnetic field intensity of the imaging magnetic field and a target magnetic field intensity of the imaging magnetic field.

US Pat. No. 10,463,882

MEDICAL RADIATION DEVICE

SHANGHAI UNITED IMAGING H...

1. A medical radiation apparatus comprising:a main frame, and a CT assembly and a radiation assembly respectively positioned on an end of the main frame along a first axial direction;
wherein the radiation assembly comprises a treatment head rotatable around the first axial direction, for emitting radiation rays;
wherein the CT assembly comprises a ray tube and a detector in an opposing arrangement, the ray tube and the detector are respectively positioned on opposite sides of the first axial direction and rotatable around the first axial direction;
wherein the treatment head is fixed to one end of the main frame;
wherein the CT assembly comprises a CT rotor rotatably mounted to the main frame, the CT rotor rotates around the first axial direction with respect to the main frame, and the ray tube and the detector are mounted on the CT rotor; and
wherein during a radiation treatment using the treatment head, the CT rotor rotates along with the main frame when the main frame rotates, and during imaging of an object located within the CT assembly, the CT rotor is rotatable independent of the main frame.

US Pat. No. 10,467,757

SYSTEM AND METHOD FOR COMPUTER AIDED DIAGNOSIS

SHANGHAI UNITED IMAGING H...

1. A method of training a classifier implemented on a computing device having one or more processors and one or more storage devices, the method comprising:acquiring an original image;
preprocessing the original image to determine preprocessed data, the preprocessing including an interpolation treatment, a morphological treatment, a Hessian dot-enhancement treatment, or a Hessian line-enhancement treatment;
segmenting, based on at least two segmentation models, the preprocessed data to determine a candidate target;
extracting features from the candidate target to determine a universal set of features;
selecting features from the universal set of features to determine a reference subset of features, wherein the universal set of features includes features extracted from the candidate target; and
performing, based on the reference subset of features, classifier training to determine a classifier.

US Pat. No. 10,456,103

UNIFIED TRAJECTORY GENERATION PROCESS AND SYSTEM

SHANGHAI UNITED IMAGING H...

1. A method implemented on a computing device having at least one processor and a storage device storing a set of instructions for controlling a system operatively connected to the computing device, comprising:obtaining, by the at least one processor, a plurality of positions for multiple components of the system defined by a plan;
obtaining, by the at least one processor, a set of constraints that express limitations for the multiple components at the plurality of positions, the constraints being applicable to the plan where the multiple components synchronously change their positions with time to traverse a prescribed sequence of the plurality of positions, at least one of the multiple components being further constrained to change its position over time by staying within a predefined tolerance to a predefined smooth function of position over time between different positions;
determining, by the at least one processor, a trajectory of position and a minimum duration in which the multiple components completely synchronously traverse the prescribed sequence of positions while satisfying the constraints for the multiple components;
generating, by the at least one processor, a record of the determined trajectory of position and the minimum duration for the multiple components; and
controlling, by the at least one processor, the multiple components of the system to execute, in synchronous motion, the determined trajectory within the determined minimum duration.

US Pat. No. 10,357,218

METHODS AND SYSTEMS FOR EXTRACTING BLOOD VESSEL

SHANGHAI UNITED IMAGING H...

1. A method for extracting a blood vessel implemented on at least one machine each of which has at least one processor and storage, the method comprising:acquiring an image relating to a blood vessel, the image including multiple slices;
determining a region of interest in the image;
determining a centerline of the blood vessel;
establishing a blood vessel model; and
extracting the blood vessel from the region of interest based on the blood vessel model and the centerline of the blood vessel,
wherein the centerline of the blood vessel is determined according to one or more operations including:
retrieving training samples;
performing a classifier training based on the training samples to determine weak classifiers;
combining the weak classifiers to determine a strong classifier;
determining an enhanced image based on the strong classifier; and
determining the centerline of the blood vessel in the enhanced image based on a fast marching algorithm.

US Pat. No. 10,338,239

DETECTOR IN AN IMAGING SYSTEM

SHANGHAI UNITED IMAGING H...

1. A method for evaluating a working condition of a photodetector of a detector in an imaging device comprising:receiving radiation by the detector in response to which a plurality of single events occur, wherein the detector includes a scintillator and the radiation is generated by a background radiation of the scintillator;
generating, by the photodetector, an electronic signal relating to the plurality of single events;
determining a parameter of the electronic signal relating to a photon energy spectrum of the plurality of single events; and
evaluating the working condition of the photodetector based on the parameter.

US Pat. No. 10,315,048

RADIATION METHOD AND APPARATUS FOR RADIATING A FLUENCE MAP HAVING ZERO FLUENCE REGION

SHANGHAI UNITED IMAGING H...

1. A radiation method, for radiating a fluence map having a zero fluence region under a movement of MLC (Multi-Leaf Collimator), comprising:a determining step of determining a basic fluence map from the fluence map, said basic fluence map comprising at least one region group each having a first non-zero fluence region and a second non-zero fluence region, the first non-zero fluence region and the second non-zero fluence region having the zero fluence region positioned therebetween;
a first radiating step including radiating the first non-zero fluence region, along with moving a first group of leaf pairs of the MLC in the first non-zero fluence region and moving a vertical jaw to shade the first group of leaf pairs in sequence; and
a second radiating step including radiating the second non-zero fluence region, along with moving a second group of leaf pairs of the MLC in the second non-zero fluence region and withdrawing the vertical jaw to expose the second group of leaf pairs in sequence.

US Pat. No. 10,282,844

SYSTEM AND METHOD FOR IMAGE SEGMENTATION

SHANGHAI UNITED IMAGING H...

1. A method of image processing implemented on at least one machine, each of which has at least one processor and storage device, the method comprising:acquiring a three-dimensional image data set representative of a region including at least one airway, the data set comprising a plurality of voxels;
identifying a first-level seed within the region;
identifying a first-level airway within the region based on the first-level seed;
defining a plurality of second-level seeds based on the first-level airway;
identifying a second-level airway within the region by performing growing based on the plurality of second-level seeds using an energy-based 3D reconstruction algorithm; and
fusing the first-level airway and the second-level airway to form an airway tree.

US Pat. No. 10,282,871

SYSTEMS AND METHODS FOR PET IMAGE RECONSTRUCTION

SHANGHAI UNITED IMAGING H...

1. An imaging method implemented on at least one machine each of which has at least one processor and storage, the method comprising:obtaining a 3D CT image of a scanning area of a subject, the 3D CT image including a plurality of CT image layers, a CT image layer corresponding to a group of spatial points relating to the subject;
obtaining PET data of the scanning area of the subject, the PET data corresponding to a first motion signal with a plurality of motion phases of the subject;
gating the PET data based on the plurality of motion phases of the first motion signal;
reconstructing, based on the gated PET data, a plurality of gated 3D PET images, a gated 3D PET image corresponding to one of the plurality of motion phases, a gated 3D PET image including a plurality of gated PET image layers, a gated PET image layer corresponding to a group of spatial points relating to the subject;
registering the plurality of gated 3D PET images with a reference 3D PET image;
determining, based on the registration, a motion vector field corresponding to a gated 3D PET image of the plurality of gated 3D PET images, a motion vector field corresponding to a motion phase;
determining, for each of the plurality of CT image layers, a motion phase based on the motion phases of the plurality of gated 3D PET images;
correcting, for each of the plurality of CT image layers, based on a motion vector field of a gated 3D PET image corresponding to the same motion phase as the CT image layer with respect to a gated 3D PET image corresponding to a reference motion phase, the CT image layer with respect to the reference motion phase; and
reconstructing a gated PET image with respect to the reference motion phase based on the corrected CT image layers and the PET data, wherein the reconstructing the gated PET image with respect to the reference motion phase based on the corrected CT image layers and the PET data includes:
determining an attenuation map based on the corrected CT image layers; and
reconstructing the gated PET image with respect to the reference motion phase based on the attenuation map and the PET data.

US Pat. No. 10,275,879

SYSTEM AND METHOD FOR IMAGE REGISTRATION IN MEDICAL IMAGING SYSTEM

SHANGHAI UNITED IMAGING H...

1. A system of image processing, comprising:a storage storing a set of instructions; and
at least one processor in communication with the storage, wherein when executing the instructions, the at least one processor is configured to cause the system to:
acquire a reference image of an object and a floating image of the object;
perform a coarse registration on the floating image and the reference image to obtain an intermediate image;
perform a fine registration on the intermediate image and the reference image to obtain an auxiliary image, the fine registration comprising aligning a region of interest in the intermediate image with a reference region of interest in the reference image;
perform a super-fine registration on the auxiliary image and the reference image to obtain a target image, the super-fine registration comprising aligning a characteristic in the auxiliary image with a reference characteristic in the reference image.