| 摘要 |
PROBLEM TO BE SOLVED: To effectively utilize gradation after A/D conversion by changing dynamic range of X-ray detector according to X-ray exposure condition, and improving image quality, in perspective view, of a part comprising such region as X-ray absorption is significantly different. SOLUTION: Based on the information inputted from a KB (keyboard) 23, an X-ray exposure condition selecting part 19 selects an X-ray exposure condition, and with the X-ray exposure condition, a corresponding table 17 is searched for reading such gain control state as matches exposure condition, thus an analogue SW setting part 15 is driven. Using the signal of the analogue SW setting part 15, integration capacities 49, 53, and 57 of a first stage Integration amplifier 47 are switched for gain control.
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