| 摘要 |
PURPOSE:To always perform accurate diagnosis, by obtaining the dose distribution of an object due to the irradiation with X-rays from at least two places different in an angle of rotation from each other to calculate the center of the object and allowing said center to automatically coincide with the center of an image pickup region to display a re-constituted image. CONSTITUTION:A CPU 10 calculates the center of an object 4 on the basis of the dose distribution of the object 4 at each rotary position of an X-ray tube 1 to display a re-constituted image on a display 12. A high speed operation apparatus 13 calculates the X-ray transmission data of the object 4 at each rotary position of the X-ray tube 1 stored in a memory disk 11 on the basis of the control of the CPU 10 by operational processing. When the X-ray tube 1 and X-ray detector 2 in a gantry 6 are integrally rotated around the object 4, the dose distributions of the object at least at two places, for example, at angles of rotation of 0 deg., 90 deg. are calculated. By this method, when the object 4 is present within an image pickup region at the time of image pickup, the re-constituted image can be displayed at the center of a re-constitution region even when both centers 4c, 3c do not coincide with each other. Therefore, the object 4 can be separated from the X-ray tube 1. |
