| 摘要 |
The X-ray intensities of a number of cross sections are detected by detector (3) and an X-ray intensity differentiating unit (8) calculates a rate of change of the X-ray intensity in the direction perpendicular to a slice surface. The rate of change is calculated for X-ray intensities measured at all irradiation angles by all the radiation detectors constituting the detector (3). In order to correct the nonlinear partial volume effect, the measured X-ray intensity is corrected in X-ray intensity correcting unit (9) based on said rate of change. Then a CT image is reconstructed using the corrected intensity values in CT image calculating unit (10). Hence, the reconstructing unit (4) comprises X-ray intensity correcting unit (9) as a preprocessing unit of the CT image calculating unit (10). <IMAGE> |
