PROBLEM TO BE SOLVED: To further reduce an exposure dose of a subject by restricting an X-ray irradiation range to the necessity minimum.SOLUTION: An X-ray tube 41 irradiates X rays. An X-ray detector 61 is formed by arranging a plurality of X-ray detection elements, each of which detects the X ray. X-ray diaphragms 43 are configured to variably set the X-ray irradiation range in a section between the X-ray tube 41 and the X-ray detector and each has a plurality of mechanism sections capable of individually setting the irradiation ranges.COPYRIGHT: (C)2011,JPO&INPIT【課題】X線の照射範囲を必要最小限に制限して被検体の被曝線量のさらなる低減を図る。【解決手段】X線管41は、X線を放射する。X線検出器61は、それぞれがX線を検出する複数のX線検出素子を配列してなる。X線絞り器43は、X線管41と前記X線検出器との間の区間におけるX線の照射範囲を可変設定するものであり、それぞれが照射範囲を個別に設定可能な複数の機構部を備える。【選択図】 図1
