期刊
RADIOTHERAPY AND ONCOLOGY
卷 108, 期 2, 页码 254-258出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.radonc.2013.06.025
关键词
Breast cancer radiotherapy; Heart dose; Left anterior descending coronary artery; Delineation; Inter-observer variation
资金
- Medical Research Council [MC_U137686858] Funding Source: researchfish
- Medical Research Council [MC_U137686858] Funding Source: Medline
- MRC [MC_U137686858] Funding Source: UKRI
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. (C) 2013 Elsevier Ireland Ltd. All rights reserved.
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