A fast semi-automatic prostate contouring method is provided using
model-based initialization and an efficient Discrete Dynamic Contour (DDC)
for boundary refinement. The user initiates the process of the preferred
embodiment by identifying four (4) points on the prostate boundary,
thereby scaling and shaping a prostate model, and then the final prostate
contour is refined with a DDC. The method of the present invention has
particular application during the pre-implant planning phase of a
brachytherapy procedure. However, this method also has uses in any phase
of dose planning in the brachytherapy procedure or any other therapy
approach.