VMAT techniques for lymph node-positive left sided breast cancer

  • Pasler M
  • Lutterbach J
  • Björnsgard M
 et al. 
  • 29

    Readers

    Mendeley users who have this article in their library.
  • 10

    Citations

    Citations of this article.

Abstract

Purpose: To investigate the plan quality of two different volumetric modulated arc therapy (VMAT) techniques for lymph node-positive left-sided breast cancer. Methods: Two VMAT plans were generated for 10 lymph node-positive left-sided breast cancer patients: one plan using one single segment of a full rotation, typically an arc segment of 230° (1s-VMAT); and a second plan consisting of 2 small tangential arc segments of about 50° (2s-VMAT).For plan comparison, various dose and dose volume metrics (Dmean, D98%, D2% for target volumes, D2%, Dmean and Vx% for organs at risk (OAR)) were evaluated. Results: Both techniques fulfilled both clinical target dose and OAR goals. 1s-VMAT achieved a slightly better homogeneity and better target coverage (D2%=54.2±0.7Gy, D98%=30.3±1.8Gy) compared to 2s-VMAT (D2%=55.0±1.1Gy, D98%=29.9±1.7Gy). For geometrical reasons, OAR sparing was noticeable but not significant better using 2s-VMAT, particularly heart and contralateral breast. The heart received a mean dose of 4.4±0.8Gy using 1s-VMAT and 3.3±1.0Gy using 2s-VMAT; the contralateral breast received 1.5±0.3Gy and 0.9±0.3Gy, respectively. Conclusions: A VMAT technique based on two small tangential arc segments enables improved OAR sparing, the differences between the two techniques in target coverage and homogeneity are minor. Patient age and -anatomy must be considered for each individual case when deciding which technique to be used.

Author-supplied keywords

  • Left-sided breast cancer
  • OAR sparing
  • VMAT

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Dietmar GeorgMedical University of Vienna

    Follow
  • Marlies Pasler

  • Johannes Lutterbach

  • Mari Björnsgard

  • Ursula Reichmann

  • Susanne Bartelt

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free