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Table 2 Comparison of the target volume protocols for Hospital A & B

From: A comparison of two systems of patient immobilization for prostate radiotherapy

  Hospital A Hospital B
GTV Prostate N.A.
CTV Prostate + proximal bilateral seminal vesicle (SV) Prostate (+ whole SV if involved)
PTV CTV + 1 cm (0.5 cm for posterior margin) CTV + 0.5 to 1 cm (1 cm margin is usually used except 0.6 cm posteriorly)