X-ray ct apparatus and control method

A control method of an X-ray CT apparatus comprising a gantry including a scanner with an imaging system, and a stand configured to tiltably support the scanner;

• a couch including a top plate on which a subject is placed;
• and a moving mechanism configured to move at least one of the gantry and the couch along a moving direction, the control method comprising:
• executing either a first control to tilt the scanner and to control the moving mechanism in such a manner that the gantry and the couch move away from each other, based on a first signal for a transition from a first positional relationship between the gantry and the couch at a time of executing first imaging with use of the couch to a second positional relationship between the gantry and the couch at a time of executing second imaging with no use of the couch, or a second control to tilt the scanner and to control the moving mechanism in such a manner that the gantry and the couch approach each other, based on a second signal for a transition from the second positional relationship to the first positional relationship.