Patent ID: 9489736
Filing Date: 2016-11-08
CPC Classification: A61B,A61N,G06T

Claim Text:
1. A method of evaluating irradiation therapy of a patient, the method comprising: obtaining first and second datasets representative of first and second CT images of the patient at different times, respectively; obtaining a deformation field, which includes three dimensional vector field entries, representative of changes in one or more regions of the patient between the first and second datasets, wherein the deformation field is generated by performing a rigid or non-rigid registration; subsequent to completion of the rigid or non-rigid registration, selectively filtering the entries of the deformation field depending on size of the one or more regions, wherein, for each of the one or more regions whose size is not within a selected size range, the filtering comprises band pass filtering to filter the entries representative of the changes that affect the respective region whose size is not within the selected size range; and generating a succession of images representing different magnitudes of deformation based on the first CT image and the filtered entries of the deformation field, thereby to visualize deformations in enabling differentiation between changes in the patient's anatomy and changes, in particular errors, in the patient's position.