Patent Number: 
Section: claims

1. An X-ray computed tomography apparatus comprising: an X-ray tube for irradiating an object with X-rays;  a detector for detecting X-rays transmitted through the object;  a noncontact type signal transmission device for transmitting a signal output from said detector;  a unit for generating image data on the basis of the signal transmitted through said noncontact type signal transmission device; and  a unit for displaying the image data,  wherein said noncontact type signal transmission device comprises:  a stationary portion;  a rotating ring disposed inside said stationary portion;  a plurality of light-emitting devices discretely arranged on an outer surface of said rotating ring;  a plurality of light-receiving devices discretely arranged on an inner surface of said stationary portion; and  a plurality of beam condensing devices arranged between said light-emitting devices and said light-receiving devices and having the function of condensing light in a direction parallel to a rotation axis of the rotating ring.