| 摘要 |
PURPOSE:To dispense with interpolative calculation by making it possible to obtain parallel beam data by rearranging data from the arrangement of the fan-shaped beam imaging data wherein radiation detectors are arranged in a fan shape with respect to a radiation source. CONSTITUTION:All of the angles alpha formed by the adjacent radiation detectors 2a-2m of a radiation detector group and a radiation source 1 are made equal and an angle-of-rotation pitch at the time of imaging is made equal to the angle alpha and, when the numbers of the radiation detectors are set to I in clockwise rotation and the angle coordinates of an imaging position are set to J (J=1-N) in counterclockwise rotation, D (I, Jo) is read from imaging data D (I, J) by coordinates address calculation wherein Jo=I+J is calculated at the time of I+J<=N and Jo+I+J-N is calculated at the time of I+J>N or D (I, J) is rearranged to D (I, Jo) by address calculation. By this method, the conversion of fan-shaped beam data to parallel beam data by interpolative calculation is made unnecessary and an image can be constituted at a high speed. |
