| 摘要 |
PURPOSE:To provide a fluoroscope which can improve the SN ratio and the image resolution by surely eliminate the fixed pattern noise out of an image to be examined. CONSTITUTION:The filters 4a, 4b and 4c serve as the X-ray absorbers which have the same absorptivity as an object 3 to be examined. Then the filters 4a-4c are irradiated by the X-ray through an X-ray device 1 in the same conditions as for the object 3. The transmitted X-ray is visualized by an image sensor 5, and photographed by a TV camera 6. Thus the images of filters 4a-4c are acquired and then subtracted from the image of the object 3 so that the structural noises can be reduced. |
