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Table 1 Rectum contouring techniques

From: Comparison of rectal volume definition techniques and their influence on rectal toxicity in patients with prostate cancer treated with 3D conformal radiotherapy: a dose-volume analysis

Methods Techniques
1 All prostate-containing CT sections
2 1 cm above and below PTV-containing sections
3 110 mm of rectum starting from the anal verge
4 Anal verge to the sigmoid flexure