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Hot spot with TomoDirect™ (Accuray Inc., Sunnyvale, CA) three-dimensional conformal radiotherapy (strip of high dose volume seen at lateral end outside planning target volume). Dose volumes are given with reference to prescription dose. 55 Gy, i.e. 110% of 50 Gy prescription dose; 53.5 Gy, i.e. 107%; 47.5 Gy, i.e. 95% of 50 Gy prescription dose.
