Patent ID: 7668287

Claim:
A radiation CT apparatus, comprising: an imaging portion constituted by a radiation source that emits radiation in a conical manner, a detecting panel for detecting the radiation, the radiation source and the detecting panel being provided to face each other with an axis of rotation that passes though a predetermined position sandwiched therebetween, and rotating means for integrally rotating the radiation source and the detecting panel about the axis of rotation; and readout means for reading out image signals which are recorded in detection pixels that constitute the detecting panel; the imaging portion continuously imaging a subject which is placed at the predetermined position while rotating the radiation source and the detecting panel about the axis of rotation, and the image signals being read out for each imaging operation by the readout means; further comprising: setting means for setting a necessary readout region within the detecting panel; and control means for referring to the results of setting by the setting means and controlling the readout means such that only image signals recorded in detection pixels within the necessary readout region are read out.