Microsoft PowerPoint - L00 Introduction

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Planning Parameters
Prescription Point - 100% to the median dose in PTV (ICRU 83)
Target coverage and OAR requirements, both objectives and
mandatory constraints are documented on Anal IMRT planning sheet
(Appendix 4).
Preferred priority of structures in planning
1) PTV’s – these will always take priority over any OAR constraint.
2) Small bowel
3) Femoral Heads
4) Genitalia
5) Bladder