| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus reducing image artifact caused by the focal movement of an X-ray tube device due to thermal expansion or the like, and correcting a focal position resulting from the exchange of X-ray tube devices, by a simple mechanism. <P>SOLUTION: This X-ray CT apparatus includes: an X-ray tube having a rotary anode which generates X-ray beams by collision of electron beams, with a collision position defined as an X-ray focal point; an X-ray detector disposed to face the X-ray tube; a collimator disposed on the X-ray beam radiation surface side of the X-ray tube and restricting the radiation range of the X-ray beam. The collimator has a pair of shielding plates which are disposed in parallel and restrict the radiation range of the X-ray beam at least in the rotation central axis direction of the rotary anode, a first adjusting mechanism which controls the interval between the pair of shielding plates to adjust the radiation range of the X-ray beam, and a second adjusting mechanism which adjusts the positions of the pair of shielding plates in the rotation axis direction of the rotary anode, while keeping the interval of the pair of shielding plates. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
