PROBLEM TO BE SOLVED: To remove an influence of a wave tail of a tube voltage waveform and to thus improve a quality of a radiological phase contrast image obtained when performing a phase imaging by radiation such as X-ray.SOLUTION: A radiological image detection apparatus includes: a first grating 31 a second grating 32 that has a period which substantially coincides with a pattern period of a radiological image formed by radiation having passed through the first grating 31 a scanning unit 33 that relatively displaces the radiological image and the second grating 32 to a plurality of relative positions at which phase differences of the radiological image and the second grating 32 are different from each other a radiological image detector 30 that detects the radiological image masked by the second grating 32 a radiation detection unit 36 that detects the radiation and a control unit. The control unit allows the scanning unit 33 to perform a relative displacement operation of the first grating 31 and the second grating 32 in a time period in which a radiation dose detection value of the radiation detected by the radiation detection unit 36 is attenuated to a level at which the radiation dose value does not have a substantial effect on an image of the radiological image detector 30.COPYRIGHT: (C)2012,JPO&INPIT【課題】X線等の放射線による位相イメージングにおいて、管電圧波形の波尾による影響をなくし、得られる放射線位相コントラスト画像の画質を高める。【解決手段】放射線画像検出装置は、第1の格子31と、第1の格子31を通過した放射線により形成される放射線像のパターン周期と実質的に一致する周期を有する第2の格子32と、放射線像と第2の格子32との位相差が互いに異なる複数の相対位置に、放射線像と第2の格子32とを相対変位させる走査手段33と、第2の格子32によってマスキングされた放射線像を検出する放射線画像検出器30と、放射線を検出する放射線検出手段36と、制御手段とを備える。制御手段は、放射線検出手段36により検出される放射線の線量検出値が放射線画像検出器30の画像に実質的に影響のない線量値まで減衰した期間内に、走査手段33による第1の格子31と第2の格子32との相対変位動作を行わせる。【選択図】図1
