| 摘要 |
PROBLEM TO BE SOLVED: To obtain an X-ray picture which is entirely sharp in X-ray photographing of a conical X-ray beam irradiating system. SOLUTION: A cone beam angleθb on the filament side of a conical X-ray beam CB is restricted and narrowed with respect to the X-ray detecting surface 2A of a panel-type X-ray sensor 2 for detecting transmitted X-rays to remove an X-ray beam part whose effective focus is large. Since a situation where the effective focus is partially large in the conical X-ray beam CB is eliminated, an X-ray radiographic image projected on the surface 2A of the sensor 2 with the irradiation of the beam CB from an X-ray irradiation part 1 is not blurred. As the result, the finally obtained X-ray CT picture becomes entirely sharp.
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