| 摘要 |
PURPOSE:To form an accurate tomographic image of an examinee by processing data obtained without using any radiation source and radiographic data on the examinee when a radiation source is used. CONSTITUTION:The examinee 5 is put between the RI (radioisotope) unit 3 where Ri-ray source 2 is set and a radiation detector 4, and radiographic transmission data on the examinee 5 is detected by the radiation detector 4 by rotating the RI-ray source 2 and radiation detector 4 in one body or rotating the examinee 5 itself. When the CT calibration of this device is performed, scanning operation is performed firstly without setting the RI-ray source 2 and calibration data is obtained. Then, the RI-ray source 2 is set and scanning operation is performed to obtain radiographic data on the examinee. Then specific subtraction between both data is performed so as to remove the influence of the background, and read data is obtained to generate image data. |
