1. A method that evaluates k-space data acquired by the operation of a magnetic resonance (MR) apparatus, said method comprising:operating an MR data acquisition scanner, while a subject is situated therein, in order to execute a spin echo MR data acquisition sequence in which a plurality of individual echoes are acquired from the subject in each of a plurality of echo trains, and in which each echo train is phase-encoded by a phase-encoding gradient, each individual echo having a signal intensity and having a sequence position in the echo train in which that individual echo was acquired;
using a computer to enter said individual echoes into a memory organized as k-space, as k-space data, so that said individual echoes occupy original positions in k-space according to said phase-encoding, thereby producing a signal evolution of said signal intensity of said individual echoes with regard to the respective original positions of said individual echoes in k-space determined by said phase-encoding;
in said computer, executing a reordering algorithm that changes the respective original positions in k-space in to reordered positions respectively occupied by said individual echoes, in order to reduce artifacts in an MR image that is reconstructed from said k-space data, due to said signal intensity impermissibly changing by an amount of change that was calculated in said reordering algorithm over a number of said original positions that were changed in said reordering algorithm, and thereby causing said individual echoes to be situated at said reordered positions in k-space;
in said computer, testing said reordered positions by comparing, for a selected k-space element, a sequence position of the individual echo represented in the selected k-space element to the sequence position of the individual echo represented in a k-space element that is adjacent in k-space, to said selected k-space element, said sequence position of said adjacent k-space element being either a sequence position of the individual echo represented in the adjacent k-space element in a same echo train of, or a different echo train from, the echo train of the individual echo represented in said selected k-space element and, when said selected position of the individual echo represented in said selected k-space element exceeds a predetermined amount of change from the sequence position of the individual echo represented in said adjacent k-space element, generating an error message in said computer;
in said computer, in response to said generated error message, modifying said reordering algorithm and applying the modified reordering algorithm to said original positions of said individual echoes in k-space, and again testing the reordered positions produced by said modified reordering algorithm, and then subsequently repeating said testing and said modifying until said predetermined amount of change is not exceeded; and
making the k-space data, that has been organized in k-space according to the reordering algorithm for which said predetermined amount of change is not exceeded, available as a data file from said computer in a form which allows the reconstruction of said MR image therefrom.