Meltem Kırlı,
University of Agriculture Faisalabad, Pakistan
Title: A heart atlas for breast radiation therapy and the influence of deliniation education on both intra and inter observer variability
Biography
Biography: Meltem Kırlı,
Abstract
Purpose: We developed a heart atlas for breast radiation therapy and evaluated the influence of education on intra and interobserver similarity and cardiac dose reporting.
Materials and Methods: The data of 16 left breast cancer patients were analyzed. Eight observers delineated heart and cardiac subunits [left (LCA) and right (RCA) coronary arteries, left anterior descending artery (LAD), bilateral atrium and ventricles] before the education. A radiologist and radiation oncologist developed the atlas and delineated the gold standard (GS) volumes. Observers repeated the delineation after education. RT plans were made for pre/post-atlas contours. The similarity was assessed by Dice (DSC) and Jaccard (JSC) similarity coefficient indices. The absolute difference rate was calculated for the dose analysis.
Results: The inter-observer similarity increased in heart and all subunits. The intra-observer similarity showed a heterogeneous distribution. The absolute difference rate in dose reporting was statistically significant for the bilateral atrium, right ventricle, LAD, LCA+LAD, RCA’s maximum doses (p<0.05). The maximum dose reporting differences from the GS decreased from 16.9 to 8.9% for LAD (p=0.011); from 14.8 to 9.3% for LCA+LAD (p=0.010).
Conclusion: The cardiac atlas reduces the intra interobserver differences and improves dose reporting consistency. The first intra-observer similarity analysis was made in our study and revealed the need for repeated education to increase consistency.