| 摘要 |
PROBLEM TO BE SOLVED: To improve image quality of a restricted image by a simple deterioration suppression processing, by judging between deterioration and non- deterioration through comparison between a presence region and a background region of an object in projection data and changing the deteriorated region into the background region. SOLUTION: An image restructuring processor 5 extracts and restructures a blood vessel region and a background region in differential projection data according to the control from a CPU7 so as to generate differential image data. After that, the blood vessel image region and the background image region based on a present pixel value are extracted. A pixel, where an X-ray path of, for example, every 1.5 deg. in projection angle passes through, in the extracted pixel groups is projected on a projection face in the projecting direction so that whether the projecting point is included in the background region is judged. When it is included, the pixel on the X-ray path is judged not to be in the blood vessel region and the pixel value is set to the preset blood basel level or less. Then, pixels in all the X-ray path in the projection angle θ1 are processed and then the pixels in all the projection angles are processed in the same way. |
