| 摘要 |
A method of detecting the extent of a lung nodule in a scan image comprises fine segmenting 14 a region around the nodule into foreground and background, filling holes within foreground areas 16, region growing the foreground 18 to identify an initial region of interest, determining a mask 20 by enlarging the initial region to contain background and to exclude other foreground regions, determining a spatial map 26 of connectivity within the mask to a point within the initial region, region growing 28 within the mask and determining the maximum edge contrast 30 during region growing. The region of maximum edge contrast identifies the extent of the nodule 32. The position of the nodule may be a seed point identified by the user 12 . Most preferably, an optimum seed point is determined by iterative determination of seed points 22, 24 so that the determined extent of the nodule is substantially independent of the precise location of the seed point identified by the user. |
