A CT scanner (10) for obtaining a medical diagnostic image of a subject
includes a stationary gantry (12), and a rotating gantry (14). The
detected radiation is reconstructed and divided into sub-portions, which
sub-portions are aligned by a registration processor (56). The registered
images are stored in a high resolution memory (58) and a maximum artery
enhancement value is calculated from the high resolution images. A
resolution reducer (82) reduces the resolution of the high resolution
images. Time-density curves are found for the voxels of the images, which
time-density curves are truncated to eliminate unwanted data, and analyzed
to determine characteristic values. A perfusion calculator (106)
calculates perfusion by using the maximum artery enhancement value and the
characteristic values. A diagnostician can view any one of a low
resolution image, a high resolution image, and a perfusion image on a
video monitor (112).
