Patent ID: 7848482

Claim:
An X-ray CT device, comprising: a stationary part; a rotary part provided rotatably relative to the stationary part; an X-ray tube being provided at the rotary part and that radiates X-ray beams on an object of imaging; an X-ray detector being provided at the rotary part so as to oppose the X-ray tube, and that detects the X-ray beams passed through the object; an image processor that generates cross-sectional images of predetermined portions of the object based on a detection signal outputted from the X-ray detector; a display that shows the cross-sectional images based on output signals delivered from the image processor; a rotary step-up transformer that steps up AC voltage by an AC power supply, the rotary step-up transformer including a primary part and a secondary part, the primary part being annular in form and being provided at the stationary part and including a primary winding being provided circumferentially, and the secondary part being provided at the rotary part so as to confront the primary part over a gap and including a plurality of secondary cores disposed circumferentially and a secondary winding configured by a plurality of windings each being wound on each of the secondary cores, the windings being interconnected in series; and a rectifier circuit that generates DC voltage by rectifying AC voltage occurring between terminals of the secondary winding.