OBJECTIVE: To evaluate and optimize the parameters used in multiple-atlas-based segmentation of @entity263 in radiation therapy. METHODS: A retrospective study was conducted, and the accuracy of the multiple-atlas-based segmentation was tested on 30 @entity1 . The effect of @entity5562 ( @entity5562 ), number of atlases used for contour averaging and the contour averaging strategy were also studied. The autogenerated contours were compared with the manually drawn contours. Dice similarity coefficient (DSC) and Hausdorff distance were used to evaluate the segmentation agreement. RESULTS: Mixed results were found between simultaneous truth and performance level estimation (STAPLE) and majority vote (MV) strategies. Multiple-atlas approaches were relatively insensitive to @entity5562 . A @entity5562 of ten was adequate, and further increase in the @entity5562 only showed insignificant gain. @entity156 performed better than single atlas for most of the time. Using more atlases did not guarantee better performance, with five atlases performing better than ten atlases. With our recommended setting, the median DSC for the bladder, rectum, prostate, seminal vesicle and femurs was 0.90, 0.77, 0.84, 0.56 and 0.95, respectively. CONCLUSION: Our study shows that multiple-atlas-based strategies have better accuracy than single-atlas approach. STAPLE is preferred, and a @entity5562 of ten is adequate for prostate cases. Using five atlases for contour averaging is recommended. The contouring accuracy of seminal vesicle still needs improvement, and manual editing is still required for the other structures. Advances in knowledge: This article provides a better understanding of the influence of the parameters used in multiple-atlas-based segmentation of @entity263 .

Evaluation and optimization of the parameters used in multiple-atlas-based segmentation of XXXX in radiation therapy.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity5562 :: ('MESH:D015875', 'Disease') :: ['LS', 'library size'] @entity263 :: ('MESH:D011471', 'Disease') :: ['prostate cancers'] @entity156 :: ('MESH:D000015', 'Disease') :: ['Multiple atlas']
@entity263 :: (MESH:D011471,Disease) :: ['prostate cancers']
