| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic exposure controller for radiography which can obtain clearer X-ray images by correcting a radiographic dose to make it within the maximum pixels from the pixels of the last perspective image before roentgenographing. SOLUTION: Radiographic X-ray equipment has a maximum pixel extraction means (21) to extract the maximum pixels from the pixels of the last, entire perspective image exposed before roentgenographing; an average calculation means (22) to calculate an average of the pixels within an area corresponding to an AEC lighting field of the perspective image; and a correction factor calculation means (23) to multiply a reciprocal correction factor to a numerical integration value which is a temporally integrated output of a photosensor being roentgenographed. COPYRIGHT: (C)2007,JPO&INPIT
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