Low signal correction for perfusion measurements

摘要

A CT scanner (10) for obtaining a medical diagnostic image of a subject includes a stationary gantry (12), and a rotating gantry (14) rotatably supported on the stationary gantry (12) for rotation about the subject. In a perfusion study 130 time-density curves of voxels of an imaging region are computed. In a low signal identification step (132), all voxels with low signal are identified. In a clustering step (134), low signal voxels are clustered together. In a representative determination step (136) representative time-density curves are computed. In a functional measurement step (138), measurements are calculated from the combined and uncombined time-density values. In an assigning step (140), each low signal voxel is assigned the values determined for its group. In a combining step (142) the results of the low and normal signal voxels are combined to produce a single functional perfusion image.