| 摘要 |
PROBLEM TO BE SOLVED: To improve the precision in positioning a bed to the bed position for non-coplanar irradiation. SOLUTION: The longitudinal direction of a treatment bed 20 is located orthogonal to the axis of rotation of a rotating gantry. An irradiation device 36 in the horizontal posture faces the top of the head of a patient on the treatment bed 20. In one X-ray photographing, an X-ray tube 31 set in an X-ray source holding member 30 radiates X-rays in the horizontal direction, and the radiated X-rays are incident on an X-ray fluoroscopic imaging device 47A. The X-ray tube 31 and the X-ray fluoroscopic imaging device 47A face each other across the patient on the treatment bed 20. In another X-ray photographing, a swivel arm device 43 rotates and the X-ray tube 31 is moved to a position just above the treatment bed 20. The vertical state of the X-ray fluoroscopic imaging device 47A is changed to be in the horizontal state by the rotation of a motor 50A. The X-rays radiated downward from the X-ray tube 31 in that state penetrate the patient to be incident on the X-ray fluoroscopic imaging device 47A located just under the treatment bed 20. COPYRIGHT: (C)2005,JPO&NCIPI
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