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Dose distribution with TomoDirect™ (TD) (Accuray Inc., Sunnyvale, CA) intensity-modulated radiotherapy (IMRT) and helical tomotherapy (HT) IMRT (whole breast only). 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. (note the helping structure, a horizontal dummy along the posterior part of the body was used for blocking the entry of the beamlets).
