| 摘要 |
PROBLEM TO BE SOLVED: To control reduction of the spatial resolving power in a reconstructed image even if a fan-pararell conversion is performed.SOLUTION: In performing data conversion in a plurality of view directions to obtain equally-spaced parallel beam projection data P3 with regular intervals in a channel direction of radiation paths corresponding to respective data by performing a re-arrangement process and an interpolation process to a plurality of fan beam projection data P1 in a plurality of views, the interval between the radiation paths in the channel direction is smaller than an interval geographically considered to maximize the spatial resolving power in a reconstructed image, that is a reference interval &Dgr;d obtained by dividing an interval in arrangement of detection elements in the channel direction by a projection enlargement rate on a detection surface of a detector with an isocenter ISO as a reference. Accordingly, opportunities to use highly accurate data before interpolation or data close to the data for back projection are increased, and reduction of the spatial resolving power can be controlled. |
