Patent ID: 7072437

Claim:
A radiation tomography system including a radiation source and a radiation detector opposed to said radiation source with a subject between them, comprising: a scanning device for scanning said subject by moving at least one of said radiation source and radiation detector while rotating it about said subject; a control value calculating device for calculating a control value with which an exposure of a radiation emanating from said radiation source is controlled; a display device for displaying at least one of control values, which are calculated in association with positions in the direction of rotation in which said scanning device is rotated, and control values, which are calculated in association with positions in the direction of a body axis linking said subject's head and said subject's tiptoe, in relation to the respective pieces of positional information on said subject; an adjusting device for adjusting said control values displayed on said display device; and a reduction ratio calculating device for comparing said control values displayed on said display device with succeedingly adjusted control values so as to calculate reduction ratios.