| 摘要 |
PURPOSE: To equalize an image of an object by scanning the object with X rays as a raster mode and using a single pencil beam of penetrating radioactive rays which can be modulated in the pulse width or beam width, or speed by the feedback method. CONSTITUTION: Permeable radioactive rays from an X ray tube 10 are changed to fan beams 12 at a front collimator 14 and irradiated on an object 16. Then the beams are swept by a sweeping controller 23 and an image is formed on an image pickup apparatus 18. At the apparatus, many sectors of the irradiated beams 16 are detected by a feedback detector 22 acting under the control of the sweeping controller 23 so that proper equalization of the image can be achieved, and based on the output, a shutter pin inside the assembly 20 is moved between the stop position and the open position by way of a pin driver 26 for a micro-processor 24. In this way, by improving the high space frequency characteristic part of the image and controlling the low space frequency characteristic part, a high quality radiograph can be obtained. |
