Patent ID: 8023615

Claim:
An X-ray CT apparatus for acquiring tomographic images of a patient, comprising: internal devices which include an X-ray source for irradiating the patient with X-rays, and an X-ray detector for detecting the X-rays transmitted through the patient and outputting an X-ray detection signal; a pedestal which has a rotary portion for mounting the internal devices and rotating the internal devices around the patient, and a support base supporting the rotary portion rotatably; a gantry cover, having exterior and interior surfaces, configured to cover the pedestal and to form a bore having an opening through which the patient is arranged in the bore, including an expanded cover portion which is so formed as to be expanded from the inner side of the bore toward the opening and to have a peripheral edge portion on the opening side; and at least one curved member, attached on the interior surface of the expanded cover portion, has first and second ends fixed to the peripheral edge portion, includes a curved portion curved convexly toward the inside of the bore with respect to a virtual straight line connecting the first and second ends, and is configured to be extended along a curved line segment which is obtained by geometrically projecting the virtual straight line onto the expanded cover portion.