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Fig. 2 | Radiation Oncology

Fig. 2

From: Dosimetric effect of respiratory motion on planned dose in whole-breast volumetric modulated arc therapy using moderate and ultra-hypofractionation

Fig. 2

The original VMAT plan with four arcs a is divided into respiratory phase-specific subplans (b). The starting respiratory phases were randomly determined for the first anterior and posterior arcs (phases 4 and 7, as an example). Image on the right (c) demonstrates these arcs in a single phase-specific subplan that only contains the irradiation coinciding with, for example, the eighth respiratory phase. The MUs delivered in this phase-specific subplan are indicated with bars. Dose rate is zeroed between CPs not coinciding with the eighth respiratory phase

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