PROBLEM TO BE SOLVED: To set a margin area to be added to an object area as an object to be cut in the internal organ including an affected part to be cut.SOLUTION: A support area of the internal organ supported by a texture part 61 extending from a prescribed position v in a texture area to an internal organ side including the affected part 55 is determined as an object area 51. The area of the internal organ except the object area 51 is determined as a non-object area 53. In accordance with the distance to each position on an interface 51a of the object area 51 and the non-object area 53 from the prescribed position v, a margin area 52 is set so that when the distance is located within a range of a predetermined threshold value or smaller, the thickness of the margin area gradually increases from zero to a prescribed value, and when the distance is located within a range larger than the predetermined threshold value, the thickness of the margin area is substantially constant.COPYRIGHT: (C)2012,JPO&INPIT【課題】切除すべき患部を含む臓器のうち、切除する対象となる対象領域に付加すべきマージン領域を設定する。【解決手段】構造物領域内の所定の位置vから患部55を含む臓器部分側に延びる構造物の部分61により支配される、臓器の支配領域を対象領域51として決定するとともに対象領域以外の臓器の領域を非対象領域53として決定し、所定の位置vから対象領域51と非対象領域53との境界面51a上の各位置までの距離に基づいて、距離が予め与えられたしきい値以下の範囲では、マージン領域の厚みがゼロから所定値まで次第に増加し、距離が予め与えられたしきい値より大きい範囲では、マージン領域の厚みがほぼ一定となるようにマージン領域52を設定する。【選択図】図3
