Patent ID: 8506163

Claim:
An X-ray CT apparatus comprising: an X-ray irradiator configured to irradiate an object with an X-ray; an X-ray detector configured to detect the irradiated X-ray; a table on which the object is placed; a rotation control unit configured to rotate the X-ray irradiator and the X-ray detector as one body around the object; a plurality of projectors each having a light source on a circumference having a same radius as a rotation radius of an X-ray focal point of the X-ray irradiator and each configured to irradiate an irradiation range simulating an irradiation range of the X-ray with laser light; a reception unit configured to receive an instruction for three-dimensionally sliding the plurality of projectors as one body; a setting unit configured to set a position of the plurality of projectors by sliding the plurality of projectors on a basis of the received instruction; a supporter configured to support the table and three-dimensionally slide the table by a difference between a position of a center of the circumference of the set plurality of projectors and a position of a rotation center of the X-ray focal point of the X-ray irradiator; and a scan execution unit configured to execute a scan with the table after the sliding as a scan position.