PROBLEM TO BE SOLVED: To provide an X-ray movable diaphragm device having: a plurality of diaphragm vanes which can control an irradiation range while exceeding the irradiation field center and shield vanes which can shield off focus radiation by interlocking with the movement of the diaphragm vanes.SOLUTION: An X-ray movable diaphragm device comprises: a plurality of first diaphragm vanes 1331 which limit an irradiation range of X-rays, and can independently move in a first directions while exceeding the center of a length along the first direction within the maximum diameter of the irradiation range a plurality of second diaphragm vanes 1333 which limit the irradiation range to a second direction perpendicular to the first direction and a shield part which arranges a plurality of first shield vanes 1337 which are movable in the first direction by interlocking with the movement of the first diaphragm vanes 1331, at the side of the X-ray focus point, arranges a plurality of second shield vanes 1339 which are movable in the second direction by interlocking with the movement of the second diaphragm vanes, at the side of the X-ray focus point, and shields the X-ray existing outside a region which is interposed by the first and second diaphragm vanes.COPYRIGHT: (C)2014,JPO&INPIT【課題】照射野中心を超えて照射範囲を絞ることが可能な複数の絞り羽根と、絞り羽根の移動に連動して焦点外X線を遮蔽することが可能な遮蔽羽根とを有するX線可動絞り装置を提供すること。【解決手段】本実施形態に係るX線可動絞り装置は、X線の照射範囲を第1方向に対して限定し、照射範囲の最大口径において第1方向に沿った長さの中点を超えて第1方向にそれぞれ独立に移動可能な複数の第1絞り羽根1331と、第1方向に垂直な第2方向に対して照射範囲を限定する複数の第2絞り羽根1333と、第1絞り羽根1331の動きと連動して第1方向に移動可能な複数の第1遮蔽羽根1337をX線焦点側に配置し、第2絞り羽根の動きと連動して第2方向に移動可能な複数の第2遮蔽羽根1339をX線焦点側に配置し、第1、第2絞り羽根で挟まれた領域の外部におけるX線を遮蔽する遮蔽部と、を具備することを特徴とする。【選択図】図2
