Hypofractionated whole-breast irradiation has emerged as a viable alternative to conventional fractionation. In the field-in-field forward planning technique, a merged plan with 2 to 4 segmental fields is the final plan delivered to the machine. As per the ASTRO guidelines for the hypofractionation regimen, the volume of breast tissue receiving V of the prescription dose should be less than 200 cc. However, we have noticed substantial changes to this volume (change in V between -55 cc and + 47.1 cc) after merging the subfields. This study compares the V of 29 breast plans before and after merging the subfields.
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