Inter-observer variation in delineation of the heart and left anterior descending coronary artery in radiotherapy for breast cancer: A multi-centre study from Denmark and the UK

Ebbe L. Lorenzen*, Carolyn W. Taylor, Maja Maraldo, Mette H. Nielsen, Birgitte V. Offersen, Maria R. Andersen, Dean O'Dwyer, Lone Larsen, Sharon Duxbury, Baljit Jhitta, Sarah C. Darby, Marianne Ewertz, Carsten Brink

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

90 Citations (Scopus)

Abstract

Background and purpose To determine the extent of inter-observer variation in delineation of the heart and left anterior descending coronary artery (LADCA) and its impact on estimated doses. Methods and materials Nine observers from five centres delineated the heart and LADCA on fifteen patients receiving left breast radiotherapy. The delineations were carried out twice, first without guidelines and then with a set of common guidelines. Results For the heart, most spatial variation in delineation was near the base of the heart whereas for the LADCA most variation was in its length at the apex of the heart. Common guidelines reduced the spatial variation for the heart and the length of the LAD, but increased the variation in the anterior-posterior/right-left plane. The coefficients of variation (CV) in the estimated doses to the heart were: mean dose 7.5% without and 3.6% with guidelines, maximum dose 8.7% without and 4.0% with guidelines. The CVs in the estimated doses to the LADCA were: mean dose 27% without and 29% with guidelines, maximum dose 39% without and 31% with guidelines. Conclusions For the heart, there was little inter-observer variation in the estimated dose, especially when guidelines were used. In contrast, for the LADCA there was substantial variation in the estimated dose, which was not reduced with guidelines.

Original languageEnglish
JournalRadiotherapy & Oncology
Volume108
Issue number2
Pages (from-to)254-258
Number of pages5
ISSN0167-8140
DOIs
Publication statusPublished - 1 Aug 2013

Keywords

  • Breast cancer radiotherapy
  • Delineation
  • Heart dose
  • Inter-observer variation
  • Left anterior descending coronary artery

Fingerprint

Dive into the research topics of 'Inter-observer variation in delineation of the heart and left anterior descending coronary artery in radiotherapy for breast cancer: A multi-centre study from Denmark and the UK'. Together they form a unique fingerprint.

Cite this