1. A method of using computed tomography perfusion to determine a treatment of a pulmonary lesion, the method comprising:obtaining a computed tomography perfusion (CTP) image representing blood flow in a region of a lung that includes the pulmonary lesion;
identifying, using the CTP image, a region of interest (ROI) of the pulmonary lesion,
determining, using the ROI and the CTP image, CTP values representing perfusion in the ROI of the lesion; and
classifying the pulmonary lesion according to whether the pulmonary lesion has a genetic mutation based on the CTP values and using one or more predefined thresholds corresponding respectively to one or more of the CTP values.