Flipping Book- BTP

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Target Volume Definition

Phase I

GTV

Primary tumour + involved LN

CTV

GTV +2.5-3cm margin + (at risk LN)

ext/int/pre-sacral/mesorectal

(up to mid SIJ)

PTV

CTV +8-10mm

Dose: 30.6Gy/17#/3.5 weeks. 6-15MV photons