| 摘要 |
PROBLEM TO BE SOLVED: To propose an imaging technique for computerized tomography, which rapidly computes the optimal parameter used in a reconstruction computation process for internal structure data of a body to be inspected and can obtain the internal structure data with high sharpness by using the parameter. SOLUTION: The system is provided with an X-ray source, a two-dimensional detecting means and a rotatable base section for the inspected body disposed between the X-ray source and the detecting means. The internal structure data are reconstructed from the projection images of the inspected body obtained at every angular displacement, and pixel data on a line perpendicular to the axis of the rotation of the inspected body are read from the projection images of the respective angular displacements, and an offset value of the rotation axis of the inspected body from the perpendicular line, which is dropped from the X-ray focal point to the detecting means, is set as the parameter used in the reconstruction computation process, and the pixel data at respective angular displacements are subjected to the reconstruction computation process while changing the parameter to obtain a plurality of images, and sharpness values are calculated respectively. When the maximum sharpness value is detected, the value of the parameter is specified as the optimal offset value of the rotation axis, and the internal structure data of the inspected body are reconstructed in consideration of the optimal offset value of the rotation axis. COPYRIGHT: (C)2005,JPO&NCIPI
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