PROBLEM TO BE SOLVED: To provide an X-ray phase imaging apparatus capable of preventing an occurrence of a phase fold in an image caused by a positional deviation of a grating.SOLUTION: An X-ray phase imaging apparatus includes: a plurality of gratings at least including an X-ray source 1, a phase grating G1 onto which an X-ray is irradiated from the X-ray source 1, and an absorption grating G2 onto which an X-ray passing through the phase grating G1 is irradiated； a detection part 2 for detecting the X-ray passing through the absorption grating G2； and an image generation part 6 for generating an X-ray phase contrast image 42 based on a phase difference Δφ between a step curve 21 indicating a change in the intensity of the X-ray detected by the detection part 2 when a subject T is placed between the X-ray source 1 and the phase grating G1, or between the phase grating G1 and the absorption grating G2, and a step curve 22 when the subject T is not placed. The X-ray phase imaging apparatus is configured so that an amount of deviations in relative positions of a plurality of the gratings is acquired based on a plurality of step curves 20.SELECTED DRAWING: Figure 1【課題】格子の位置ずれに起因して画像に位相折り畳みが生じることを防止可能なＸ線位相撮影装値を提供する。【解決手段】このＸ線位相撮影装置は、Ｘ線源１と、Ｘ線源１からＸ線が照射される位相格子Ｇ１と、位相格子Ｇ１を通過したＸ線が照射される吸収格子Ｇ２と、を少なくとも含む複数の格子と、吸収格子Ｇ２を通過したＸ線を検出する検出部２と、Ｘ線源１と位相格子Ｇ１の間もしく位相格子Ｇ１と吸収格子Ｇ２の間に被写体Ｔを配置した場合の、検出部２により検出されるＸ線の強度変化を表すステップカーブ２１と、被写体Ｔを配置しない場合の、ステップカーブ２２と、の間の位相差Δφに基づいて、Ｘ線位相コントラスト画像４２を生成する画像生成部６と、を備え、複数のステップカーブ２０に基づいて、複数の格子の相対位置のずれ量を取得するように構成されている。【選択図】図１
