POSITRON CT DEVICE

PROBLEM TO BE SOLVED: To eliminate uneven sensitiveness in a body axial direction during 3D positron CT photographing of a view field larger than the view field width in the body axial direction of a detector while moving a subject with respect to a multi-ring type detector. SOLUTION: To a gantry 10 having the multi-ring type detector, in which ring type detectors 11 are layered in multiple layers in the body axial direction of a subject 50, the subject 50 placed on a bed 20 is moved in the body axial direction by an interval d of each ring by means of a bed moving device 21. When data is collected while summing up, every position of the subject 50, simultaneous count data between the rings acquired for respective positions, sensitiveness is unified over the wide view field in the body axial direction, and uneven sensitiveness in the body axial direction is eliminated. COPYRIGHT: (C)2007,JPO&INPIT