APRS FOR treatment planning - repost

The aims of this practical are to deliver a clinically acceptable dose distribution to a brain tumour whilst sparing normal organs (specifically, the lens of the left eye). Three 6 MV photon beams are to be used. Gantry, floor and collimator angles are given, you are to select the appropriate field sizes and wedge angles to deliver an homogeneous dose to the planning target volume (PTV). Two beam arrangements will be compared in terms of tumour control probability (TCP) and normal tissue complication probability (NTCP).