PROBLEM TO BE SOLVED: To provide technology for attaining a small radiation imaging apparatus whose sensitivity can be adjusted.SOLUTION: There is provided a radiation imaging apparatus which includes: a detector which has a detection surface on which a plurality of detection areas for detecting radiation are arranged like an array on the radiation incident side and generates signals according to amounts of the radiation made incident on the respective detection areas one or more adjustment plates on which a plurality of transmission areas for transmitting the radiation are arranged like an array, which shield the radiation made incident on areas except the plurality of transmission areas, and adjust the amounts of the radiation to be made incident on the plurality of detection areas a holding part which holds the one or more adjustment plates so that positions where the one or more adjustment plates cover the detection surface of the detector can be moved along the detection surface and a drive part which moves the one or more adjustment plates, in which the drive part can fix the one or more adjustment plates to a plurality of positions to the detection surface, area of a part of the detection areas on which the radiation which transmits the one or more adjustment plates is made incident is different depending on the positions of the one or more adjustment plates to the detection surface in at least one of the plurality of detection areas.COPYRIGHT: (C)2013,JPO&INPIT【課題】感度を調整可能な小型の放射線撮像装置を実現する技術を提供する。【解決手段】放射線撮像装置であって、放射線を検出する複数の検出領域がアレイ状に配置された検出面を放射線入射側に有し、各検出領域へ入射した放射線の量に応じた信号を生成する検出装置と、放射線を透過する複数の透過領域がアレイ状に配置されており、複数の透過領域以外の領域へ入射した放射線を遮蔽して複数の検出領域へ入射する放射線の量を調整する1つ以上の調整板と、1つ以上の調整板が検出装置の検出面を覆う位置を検出面に沿って移動可能なように、1つ以上の調整板を保持する保持部と、1つ以上の調整板を移動する駆動部とを備え、駆動部は検出面に対して複数の位置に1つ以上の調整板を固定可能であり、複数の検出領域の少なくとも1つにおいて、1つ以上の調整板を透過した放射線が入射する検出領域の部分の面積は、検出面に対する1つ以上の調整板の位置によって異なることを特徴とする放射線撮像装置が提供される。【選択図】図3
