实用医学杂志 ›› 2025, Vol. 41 ›› Issue (14): 2138-2142.doi: 10.3969/j.issn.1006-5725.2025.14.003

• 专题报道:乳腺癌 • 上一篇    下一篇

组织补偿膜使用方式对乳腺癌根治术后胸壁皮肤剂量的影响

胡作怀,付建东,李小芳,姚欣悦,赵宾,晏涑,何思思()   

  1. 遵义医科大学第二附属医院肿瘤放射治疗科 (贵州 遵义 563003 )
  • 收稿日期:2024-12-11 出版日期:2025-07-25 发布日期:2025-07-29
  • 通讯作者: 何思思 E-mail:sisihe1219@163.com
  • 基金资助:
    贵州省自然科学基金项目(编号:黔科合基础-ZK[2022]一般626);贵州省卫生健康委科技基金项目(WJW-2024-007);贵州省抗癌协会科技计划项目(抗协科计[2023]016)

The impact of different bolus application methods on chest wall skin dose after radical mastectomy for breast cancer

Zuohuai HU,Jiandong FU,Xiaofang LI,Xinyue YAO,Bin ZHAO,Shu YAN,Sisi. HE()   

  1. Department of Radiation Oncology,the Second Affiliated Hospital of Zunyi Medical University,Zunyi 563003,Guizhou,China
  • Received:2024-12-11 Online:2025-07-25 Published:2025-07-29
  • Contact: Sisi. HE E-mail:sisihe1219@163.com

摘要:

目的 探讨组织补偿膜(Bolus)不同使用方式对乳腺癌根治术后胸壁皮肤剂量的影响。 方法 回顾性分析2023年1月至2025年3月间,医院乳腺癌根治术后需胸壁放疗的女性患者60例,用Pinnacle3 9.10放疗计划系统(TPS)为每例患者设计2个VMAT双半弧放疗计划,靶区处方剂量为50 Gy/2 Gy/25 f。Plan1前半程添加Bolus优化放疗15次,后半程10次去掉Bolus,不做计划优化,保持前半程优化计划的子野形状和剂量权重,仅做剂量计算,将有无Bolus的计划组合放疗;Plan2前半程添加Bolus优化放疗15次,后半程10次去掉Bolus,重新做计划优化,将两次优化计划组合放疗。用SPSS 29.0软件对两组计划的数据做配对样本t检验。 结果 皮肤Dmean、V52.5、V55,心脏Dmean、V5、V30、V40,患侧肺Dmean、V5、V20,脊髓外扩Dmean、Dmax,健侧乳房Dmean、V5、V10,患侧肱骨头Dmean、V30,PTV的Dmean、V50、V55、D2%、D98%、CI、MU,差异均有统计学意义(P < 0.05),且靶区层面剂量分布,DVH图明显不同;而PTV的HI(P = 0.125),差异无统计学意义。 结论 15次Bolus与10次不加Bolus的两个优化计划组合,真实反映了计划靶区与危及器官的剂量分布,能更好地保护患者胸壁皮肤。

关键词: 组织补偿膜, 乳腺癌根治术, 胸壁, 皮肤剂量

Abstract:

Objective To investigate the impact of different application methods of tissue compensators (bolus) on the skin dose delivered to the chest wall following radical mastectomy for breast cancer. Methods A retrospective analysis was conducted on 60 female patients who underwent radical mastectomy and required chest wall radiotherapy at the hospital between January 2023 and March 2025. The Pinnacle3 9.10 radiotherapy planning system (TPS) was utilized to design two VMAT dual semi-arc radiotherapy plans for each patient, with a prescribed target dose of 50 Gy delivered in 2 Gy fractions over 25 sessions. In Plan 1, a Bolus was applied and optimized during the first 15 fractions, and subsequently removed for the remaining 10 fractions without re-optimization. The sub-field configuration and dose weighting from the initial optimization were retained, and only dose recalculations were performed. The final treatment plan combined both the Bolus-included and Bolus-excluded phases. In contrast, Plan 2 involved the application and optimization of Bolus during the first 15 fractions, followed by its removal and re-optimization of the plan for the last 10 fractions. The two optimized plans were then combined for the overall treatment delivery. Data from the two plan groups were analyzed using a paired sample t-test with SPSS 29.0 software. Results There was a statistically significant difference (P < 0.05) in skin Dmean, V52.5, and V55; heart Dmean, V5, V30, and V40; affected lung Dmean, V5, and V20; PRVcord Dmean and Dmax; healthy breast Dmean, V5, and V10; affected humeral head Dmean and V30; as well as PTV Dmean, V50, V55, D2%, D98%, CI, and MU. Moreover, the dose distribution on the target layer and the DVH curves showed marked differences. However, no statistically significant difference was observed in PTV HI (P = 0.125). Conclusion The combination of the two optimized plans, consisting of 15 fractions with bolus and 10 fractions without bolus, more accurately reflects the dose distribution within the planned target area and organs at risk, thereby providing enhanced protection for the patient's chest wall skin.

Key words: blous, postmastectomy, chest wall, skin dose

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