| 摘要 |
PROBLEM TO BE SOLVED: To form a three-dimensional image of an area larger than a detected area determined by the area of a radiation detector in a cone beam CT. SOLUTION: A radiation detector 12 is moved and disposed in a photographing position P1 by a moving means to acquire projected image data in each projecting direction at this time. The radiation detector 12 is moved into photographing positions P2, P3 by the moving means to acquire projected image data in each photographing direction in the same way. A projected image data composing means of an image processing part composes projected image data D21, D22, D23 to originate composed projected image data which is the projected image data of all detected areas.
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