| 摘要 |
A contour extracting unit 41 of a contour image generating device 9 performs one-time contour extraction to a two-dimensional reconstruction image G1 by a contour extracting model so as to extract a second shape of a contour Wb from a first shape of a contour Wa. A completion determining unit 49 determines whether or not a rate of change Ra is smaller than a threshold P. The rate of change Ra is a ratio of a varied area S and a sum V of pixel values of pixels in the varied area S, the varied area S being between the first shape of the contour Wa and the second shape of the contour Wb. When the rate of change Ra is large, a repetitive controller 39 performs control to operate the contour extracting unit 41 and the like again. When the rate of change Ra is small, the repetitive controller 39 performs control to output a two-dimensional contour image Gr1 containing the second shape of the contour Wb. |
