| 摘要 |
<p>When a projection direction or position has been changed by the operation from the outside, the resolution of a projection image in a region of interest (D) on a projection plane (P) is set higher than that of the projection image other than the region of interest (D). Then, a projection image is generated by dividing, based on the resolutions, the projection plane (P) into small areas that have different sizes depending on whether an area to be divided is in the region of interest (D) and by calculating the pixel value of each of the small areas from the voxel values of three-dimensional volume data (100) projected onto the respective small areas. After all the pixel values of the small areas are calculated, projection images are generated in such a manner that the resolution of at least the projection image other than the region of interest (D) is reset gradually to a higher value.</p> |
