| 摘要 |
PROBLEM TO BE SOLVED: To provide a radiographic apparatus contrived so that an artifact derived from a radiation grid is prevented from being projected in a perspective image as far as possible even when a radiation detector is moved to a radiation source. SOLUTION: By the configuration of this invention, the width of the shadow in the lateral direction of absorption foil projected to an FPD is equal when the position of the focus of an X-ray tube to an FPD is at the position of P<SB>min</SB>and when it is at the position of P<SB>max</SB>. In such a manner, since the advancing direction of a radiation beam to the absorption foil of the radiation grid is not changed as far as possible regardless of the movement of the FPD, the radiation beam (direct beam) radiated from the X-ray tube reaches the FPD without being obstructed by the absorption foil. Thus, a false image appearing in a radiation perspective image is suppressed. COPYRIGHT: (C)2011,JPO&INPIT |
