| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To easily acquire the rotation orbital plane regarding a corn beam X-ray CT device. <P>SOLUTION: By using a phantom for the calculation of the rotation orbital plane which is constituted by linearly arranging index bodies, this corn beam X-ray CT device can perform a process for calculating the rotation orbital plane 7 which is a surface including a circular orbit in a rotating photographing. In the corn beam X-ray CT device, the rotation orbital plane calculating process includes four steps. In the first step, under a state that the phantom is separated from the rotation central axis by a specified distance, and the index bodies are arranged in such a manner that the linear arrangement may direct in parallel with the rotation central axis, the X-ray projection image of the phantom is rotation-photographed, and a plurality of projection images are collected. In the second step, a plurality of the projection images are superposed, and a synthetic projection image is formed. In the third step, a gap line regarding the orbit which is not superposed from among orbits drawn by respective index bodies on the synthetic projection image is extracted regarding the synthetic projection image. In the fourth step, coordinate values on the projection image of the rotation orbital plane based on the extracted gap line are acquired. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
