| 摘要 |
PROBLEM TO BE SOLVED: To provide estimation of distributions of subject/background areas of images stored in a radiation image detector by irradiation of a subject with transmitted radiation before the completion of image reading. SOLUTION: By uniform irradiation of a radiation image detector with a radioactive ray, storage of first leak electric current value output from each signal line while holding electric charges corresponding to the dose of irradiating radiation, irradiation of the radiation image detector with the subject-transmitted radiation, collecting the second leak electric current value while holding electric charges corresponding to the dose of irradiating radiation, determination of the total pixels on the lines as the background area when the first/second leak electric current values are equal (lines A, C), and for each line corresponding to respective signal lines, determination of the total pixels on the lines as a mixture of subject/background areas when the second leak electric current value is smaller than that of the first leak electric current value (lines B, D and E), the total number of pixels in the background area on the lines can be obtained from ratios of the first/second leak electric current values. COPYRIGHT: (C)2009,JPO&INPIT
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