Ai XQ, Tang CQ, Wu H, Garbo T, Wang X, Liu JP, Cao YF, Jin H. Comparison of positioning accuracy of different registration methods and dosimetric analysis of adaptive radiotherapy for breast cancer after breast conserving surgery.
Transl Cancer Res 2020;
9:3274-3281. [PMID:
35117694 PMCID:
PMC8797682 DOI:
10.21037/tcr.2020.04.18]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 01/18/2020] [Indexed: 11/06/2022]
Abstract
Background
This study explores the effect of different registration methods on the placement accuracy and dosimetric analysis of adaptive radiation therapy (ART) after breast conserving surgery for breast cancer, based on cone-beam computed tomography (CBCT).
Methods
Thirty breast cancer patients, who underwent breast conserving surgery, were divided into three groups, with 10 patients in each group: automatic grayscale registration (group A), automatic bony marker registration (group B), and automatic grayscale registration combined with manual bony marker registration (group C). Three registration methods were conducted before the first radiotherapy, and once a week under the guidance of CBCT. The dosimetric comparison was made with the original plan.
Results
The X direction was significantly different between groups A and B (P=0.036). The X and Y direction were significantly different between groups A and C (P=0.001, P=0.019). The placement errors were significantly different between groups B and C in the X and Y directions (P<0.001, P=0.003). The ART plan was significantly better than the original plan, in terms of the Dmax, Dmean, D90, V90, V100, V95, HI and CI of planning target volume (PTV) (P<0.05). Furthermore, the ART plan was significantly better, in terms of the Dmean, V5, V10, V20 and V30 of the affected lung, the Dmean, V5, V10, V20 and V30 of the double lung, and the Dmean, V5, V10, V20 and V30 of the heart. Moreover, the Dmax, V5 and V10 of the contralateral breast were significantly lower than those in the original CT plan (P<0.05).
Conclusions
For the CBCT placement verification after breast conserving surgery, the accuracy and stability of automatic gray-scale registration combined with manual bone markers are better than those of the automatic gray-scale registration and automatic bone marker registration.
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