PROBLEM TO BE SOLVED: To provide a radiographic phase-contrast imaging apparatus using two gratings, which prevent radiation transmitted through the two gratings from being out of a detection plane of a radiographic image detector and not received within the detection plane.SOLUTION: This radiation phase image photographing apparatus includes: a magnification factor obtaining unit 62 to receive and obtain an input of a magnification factor for the magnification imaging a moving mechanism to move the radiographic image detector in directions of relative movement toward and away from a radiation source according to the inputted magnification factor a cassette size information obtaining unit 63 to obtain size information of the radiation image detector an acceptable magnification factor calculation unit 64 to calculate an acceptable magnification factor based on the cassette size information of the radiation image detector, ensuring the radiation transmitted through the first and second gratings to be received within the radiographic image detector and a moving mechanism control unit 60a to control the moving mechanism to move the radiographic image detector by a distance according to the magnification factor only in a case where the magnification factor obtained by the magnification factor obtaining unit 62 is within a range of the acceptable magnification factor.COPYRIGHT: (C)2012,JPO&INPIT【課題】2つの格子を用いた放射線位相画像撮影装置において、2つの格子を透過した放射線が放射線画像検出器の検出面内に収まらずに外側にはみ出してしまうのを防止する。【解決手段】拡大撮影における拡大率の入力を受け付けて取得する拡大率取得部62と、入力された拡大率に応じて、放射線画像検出器を放射線源に対して相対的に離接する方向に移動させる移動機構と、放射線画像検出器のサイズ情報を取得するカセッテサイズ情報取得部63と、放射線画像検出器のサイズ情報に基づいて、第1および第2の格子を透過した放射線が放射線画像検出器内に収まるような許容拡大率を算出する許容拡大率算出部64と、拡大率取得部62によって取得された拡大率が許容拡大率の範囲内の拡大率の場合にのみ、拡大率に応じた距離だけ放射線画像検出器を移動させるよう移動機構を制御する移動機構制御部60aとを設ける。【選択図】図6
