| 摘要 |
PROBLEM TO BE SOLVED: To enhance operability by moving an effective visual field in a short time even in the case where the effective visual field required in examination reaches the outside of the detection region of an X-ray plane detector after the X-ray plane detector is positioned at an examination region. SOLUTION: The position of the effective visual field controlled by an X-ray stop control device 10 is converted into the position of the X-ray detection region of the X-ray plane detector 6 by an effective visual field position converter 11 and an effective visual field control signal for performing control so that the effective visual field always enters the X-ray detection region of the X-ray plane detector 6 is produced by an effective visual field control signal producing device 12. The effective visual field control signal is inputted to an X-ray photographing system control device 8 and the X-ray stop control device 10 to control the movement of the effective visual field and the X-ray plane detector in mutually reverse directions so that the effective visual field always enters the X-ray detection region of the X-ray plane detector. The effective visual field control signal producing device 12 is constituted of an effective visual field movement determining part 12a, an effective visual field position determining part 12b, a moving distance calculation part 12c, an X-ray plane detector movement control signal producing part 12d and an effective visual field movement control signal producing part 12e. COPYRIGHT: (C)2009,JPO&INPIT
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