| 摘要 |
PURPOSE:To improve the contrast and to make a picture easy to see, by carrying out computing of each output of X-ray quanity of the same position for the subject of the picture photographed by X-ray having different quality. CONSTITUTION:A subject 32 is photographed twice by changing ray quality of a X-ray tube 31 and an unnecessary part of a picture overlapping in the X-ray picture is removed by processing each picture with a computer 37 and the contrast for the part showing concern is improved. On this occasion, targets composed of dissimilar materials are assembled in one tube 31 so as to be suitable for the case of taking a photograph by X-ray successively by X-ray having different ray quality. |
