PROBLEM TO BE SOLVED: To provide a technique capable of photographing a relatively wide range while suppressing the generation of the deviation of a scanning system.SOLUTION: When obtaining a plurality of transmission images relating to a part to be photographed by detecting radiations for two or more times by a detection part while changing the relative position relation and angle relation of a generation part and the detection part, the relative position relation and angle relation of the generation part and the detection part changed in a time sequential manner in the state of fixing the position of the detection part. At the time, when an approach state that a mark relating to the outer edge of the part to be photographed approaches the end part of a photographable range is detected, the position of the detection part is changed.COPYRIGHT: (C)2009,JPO&INPIT【課題】走査系のずれの発生を抑制しつつ、比較的広範囲の撮影を可能とする技術を提供する。【解決手段】発生部と検出部との相対的な位置関係および角度関係を変更させつつ、検出部によって、放射線を複数回検出することで、被撮影部位に係る複数の透過像を取得する際に、検出部の位置を固定した状態で、発生部と検出部との相対的な位置関係および角度関係を時間順次に変更させる。このとき、被撮影部位の外縁に係る目印が撮影可能範囲の端部に接近した接近状態が検出されると、検出部の位置を変更させる。【選択図】図10
