Variation of V105% between pre- and postmerged subfields in field-in-field hypofractionated breast radiotherapy plans

Abhishek Dwivedi; Therese McGarry; Laura Bond; Joel K Braver; Nrusingh C Biswal

doi:10.1016/j.meddos.2019.04.002

Variation of V_105% between pre- and postmerged subfields in field-in-field hypofractionated breast radiotherapy plans

Med Dosim. 2020;45(1):19-20. doi: 10.1016/j.meddos.2019.04.002. Epub 2019 May 14.

Authors

Abhishek Dwivedi¹, Therese McGarry², Laura Bond¹, Joel K Braver¹, Nrusingh C Biswal³

Affiliations

¹ Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, New Brunswick, NJ 08876, USA; Department of Radiation Oncology, Robert Wood Johnson University Hospital Somerset, Steeplechase Cancer Center, Somerville, NJ 08876, USA; Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ 08876, USA.
² Department of Radiation Oncology, Robert Wood Johnson University Hospital Somerset, Steeplechase Cancer Center, Somerville, NJ 08876, USA.
³ Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, New Brunswick, NJ 08876, USA; Department of Radiation Oncology, Robert Wood Johnson University Hospital Somerset, Steeplechase Cancer Center, Somerville, NJ 08876, USA; Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ 08876, USA. Electronic address: [email protected].

PMID: 31101571
DOI: 10.1016/j.meddos.2019.04.002

Abstract

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_105% of the prescription dose should be less than 200 cc. However, we have noticed substantial changes to this volume (change in V_105% between -55 cc and + 47.1 cc) after merging the subfields. This study compares the V_105% of 29 breast plans before and after merging the subfields.

Keywords: Breast cancer; Field-in-field; Hypofractionation; Radiotherapy; V(105%).

MeSH terms

Breast Neoplasms / radiotherapy*
Female
Humans
Radiation Dose Hypofractionation*
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted / methods*
Retrospective Studies