Patent ID: 7420176

Claim:
A SPECT apparatus comprising: a two-dimensional detector that detects radiations from RIs in a patient via a collimator; a correction processing unit that corrects, in order to reduce a fall in spatial resolution having dependency on distances between the respective RIs and the detector, plural two-dimensional projection distributions with different projection angles, which are detected by the detector, on a three-dimensional frequency space according to plural correction functions corresponding to plural distances, respectively; and a reconfiguring unit that reconfigures a three dimensional RI distribution from the plural two-dimensional projection distributions corrected; wherein the correction processing unit includes: a coordinate transforming unit that transforms the plural two-dimensional projection distributions into a three-dimensional projection distribution represented by a three-dimensional actual space formed by a projection angle axis, a slice axis and a channel axis; a transforming unit that transforms the three-dimensional projection distribution into a representation of a frequency space according to three-dimensional Fourier transformation; a correcting unit that corrects values of respective points of the transformed three-dimensional projection distribution according to any one of the plural correction functions corresponding to distances of the respective points; and a transforming unit that transforms the corrected three-dimensional projection distribution into a representation of the actual space according to the three-dimensional Fourier transformation.