PROBLEM TO BE SOLVED: To provide an X-ray imaging apparatus capable of reducing heat transfer between a subject including a human body and a diffraction grating, compared to conventional apparatus.SOLUTION: The X-ray imaging apparatus for imaging a subject 105 includes: a diffraction grating 102 for diffracting an X-ray from an X-ray source to form an interference pattern a temperature control section for controlling the temperature of the diffraction grating and a detector for detecting an X-ray from the diffraction grating. The temperature control section controls the temperature of the diffraction grating so that the temperature Ta of the diffraction grating before being installed on the subject meets the following formula: a×b×(Ta-Tb)<(d/2), wherein (a) is the length from the diffraction grating-fixing position to the end of an X-ray irradiation range of the diffraction grating in the cyclic direction of the diffraction grating, (b) is the linear expansion coefficient of the diffraction grating, (d) is the pitch of the diffraction grating, and Tb is the temperature of the diffraction grating in imaging the subject.COPYRIGHT: (C)2013,JPO&INPIT【課題】 人体をはじめとする被検体と回折格子の間での熱の伝達を従来よりも低減させることができるX線撮像装置を提供すること。【解決手段】 被検体105を撮像するX線撮像装置は、X線源からのX線を回折して干渉パターンを形成する回折格子102と、回折格子の温度調節をする温度調節部と、回折格子からのX線を検出する検出器と、を備える。温度調節部は、被検体設置前の回折格子の温度Taが下記式を満たすように回折格子の温度調節をする。a×b×|(Ta-Tb)|<(d/2)a:回折格子の周期方向における、回折格子の固定位置から回折格子のX線照射範囲の端部までの長さb:回折格子の線膨張係数d:回折格子のピッチTb:被検体撮像時の回折格子の温度【選択図】 図1
