| 摘要 |
<P>PROBLEM TO BE SOLVED: To constantly assure the image quality improvement of a reconstruction image by surely reducing a cone beam artifact. Ž<P>SOLUTION: A scan control section 33 controls to generate a circular trajectory projection data group and a line projection data group by executing a circular trajectory scan and a line scan. An image reconstruction determination section 36 compares a difference value between projection data collected respectively at an intersection between the circular trajectory scan and the line trajectory scan, with a set threshold stored by a set information storage section 38. When the difference value exceeds the set threshold, the image reconstruction determination section 36 determines that an image reconstruction processing section 37 reconstructs an artifact-reduced image only from the circular trajectory projection data group and, when the difference value does not exceed the set threshold, determines that the image reconstruction processing section 37 reconstructs the artifact-reduced image from the circular trajectory projection data group and the line projection data group. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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