| 摘要 |
PURPOSE:To attain a high spatial resolution and a high X-ray detection sensitivity and make high-speed read out possible by using an X-ray image intensifier as a device which converts a radiation image to an optical image and stores it. CONSTITUTION:X rays irradiated to a body 1 to be examined are transmitted through the body 1 to be examined and are made incident to an X-ray image intensifier 2 and are made incident to a film 3 which is adjacent to the image intensifier 2 and consists of optical isomerizing fluorescent materials. Since the optical isomerizing fluorescent film 3 converted to have a light emitting property by the optical isomerizing reaction has an absorption spectrum different from that before optical isomerization, it emits light with a read light 4 in the same wavelength range as the absorption spectrum after isomerization. The optical image is converted to position information, which is designated by a scanning signal of the read light 4, and an intensity signal determined by the output of a photodetector 6 and is stored as an image by the known image processing technique and is reproduced. The input diameter of an optical image detector 8 can be made large to a value approximately equal to the input diameter of the X- ray image intensifier 2, and the spatial resolution can be made higher than that of the X ray image intensifier 2. |
