PROBLEM TO BE SOLVED: To facilitate alignment of a relative position to an X-ray vessel and to secure safety without impairing portability by providing an appropriate X-ray shielding part.SOLUTION: An electronic cassette 1 is constituted to be attachable to and detachable from the X-ray shielding part 18 and an annunciation unit 19. Thus, according to a moving image/still image condition or in carrying to a different system, the X-ray shielding part 18 is attached and detached for photographing or movement. The annunciation unit 19 can determine a three-dimensional position coordinate of the electronic cassette 1 by receiving radio wave transmitted from the inside of a photographing chamber. The annunciation unit 19 calculates an inclination and a value obtained by correcting the relative position to the electronic cassette 1 in addition of its own position coordinate, and transmits center position information for an imaging area of the electronic cassette 1 to a control unit 20. The control unit 20 performs position adjustment by calculating an appropriate position of the X-ray vessel 16 based on irradiation position information obtained by adding image receiving surface position information of the electronic cassette 1 transmitted from the annunciation unit 19 to an irradiation distance matched to a photographing condition.COPYRIGHT: (C)2011,JPO&INPIT【課題】X線管球との相対位置を容易にアライメント可能で、適切なX線遮蔽部を設けることにより安全性を確保し、可搬性を損うことがないようにする。【解決手段】電子カセッテ1はX線遮蔽部18及び報知ユニット19に対し着脱可能とし、動画/静止画等撮影条件や別システムへの運搬に際して、X線遮蔽部18を着脱して撮影や移動を行う。報知ユニット19は撮影室内から発信される電波信号を受信して、電子カセッテ1の三次元位置座標を割り出すことができる。報知ユニット19は自身の位置座標に加えて傾き及び電子カセッテ1との相対位置を補正した値を算出し、電子カセッテ1の撮像領域の中心位置情報を制御部20に伝達する。制御部20は報知ユニット19から送信された電子カセッテ1の受像面位置情報と撮影条件に合った照射距離を加えた照射位置情報を基に、適切なX線管球16の位置を算出し位置調整を行う。【選択図】図2
