Abstract
Accurately segmenting the prostate and surrounding radiation-sensitive organs from a CT planning scan is critical for achieving high-quality IMRT plans. Robust automatic segmentation would both reduce the time spent contouring by the physician, and potentially reduce the variability that arises due to manual segmentation. However, edge-based segmentation algorithms without a shape-model component fail due to the lack of CT contrast between the prostate and adjacent prostate and rectal wall. The inhomogeneous, unpredictable CT number distribution due to gas and filling compound the difficulties of segmenting the rectum.
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