Impact of Bias Plan dose superposition on postoperative radiotherapy planning for left breast cancer
10.3969/j.issn.1671-8348.2025.03.011
- VernacularTitle:Bias Plan剂量叠加法对左乳腺癌术后放疗计划的影响研究
- Author:
Pan LIU
1
;
Jianwei DONG
;
Wenlong ZHAO
;
Jing LIU
;
Tong ZHU
Author Information
1. 吉安市中心人民医院肿瘤科,江西 吉安 343000
- Keywords:
Sum Plan;
Bias Plan;
postoperative breast cancer;
dosimetry;
Monaco
- From:
Chongqing Medicine
2025;54(3):620-624
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the dosimetry effect of Sum Plan and Bias Plan in the Monaco planning system for the addition of compensatory agents after left breast cancer surgery.Methods Twenty-nine patients with radical left mastectomy who received radiotherapy in this hospital from March 2023 to Feb-ruary 2024 were selected as the study objects.Based on the Monaco planning system and under the same opti-mal conditions,Sum Plan and Bias Plan were used to design the second-course plan based on the first-course plan.Sum Plan C1 and Bias Plan C2 were generated to compare the dosimetry differences of intensity modula-ted radiotherapy(IMRT)plans under the two dosimetric superposition methods.Results Compared with Sum Plan C1,the conformability index(CI)in the planned target area(PTV)of Bias Plan C2 was worse,the homogeneity index(HI)was better,and the mean cardiac dose(Dmean),V5,V10,V30,V40 in the organs at risk were better than that of Sum Plan C1.The Dmean,V5,V20 and contralateral V5 in the affected lung were lower,while the V5,V10,V15,V20,V25,V30 in the normal tissue were lower,while V35 was higher,and the number of subfields and machine hops were more,the difference was statistically significant(P＜0.05).Conclusion Bias Plan dose overlay method was proposed in the design of segmental radiotherapy with compensator after left breast cancer surgery.
