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      The dosimetric study of radiotherapy after modified radical mastectomy for left breast cancer using the beam’s eye view in intensity-modulated radiation therapy

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          Abstract

          Objective To analyze the dosimetric features of chest wall radiotherapy after modified radical mastectomy for left breast cancer using the beam’s eye view (BEV) in intensity-modulated radiation therapy (B-IMRT).

          Methods A total of 13 patients treated with modified radical mastectomy for left breast cancer in the Liaocheng People’s Hospital from May 2020 to November 2020 were recruited. They were treated with postoperative radiotherapy using the plans of B-IMRT or tangential fields in intensity-modulated radiation therapy (T-IMRT). The mean dose, conformity index and homogeneity index of the target field, and dose volume parameters of left lung and heart were compared between two groups.

          Results Compared with those of T-IMRT group, B-IMRT significantly improved the conformity and homogeneity of the target field ( P < 0.05), and their mean dose of target field was similar. In addition, V 5, V 10, V 20, V 30 and D mean of the left-side lung, and V 5, V 10, V 30 and D mem of the heart in B-IMRT group were significantly reduced compared with those of T-IMRT group ( P < 0.05). In comparison to those of T-IMRT, B-IMRT decreases V 5, V 10, V 20, V 30 and D mean of the left-side lung by 9.23%, 13.29%, 9.54%, 8.28% and 10.35%, respectively, which decreases V 5, V 10, V 30 and D mean of the heart by 27.62%, 29.72%, 21.45% and 24.88%, respectively.

          Conclusion Compared with T-IMRT planning, B-IMRT presents dosimetric advantages in the conformity and homogeneity of the target field in the postoperative radiotherapy of patients treated with modified radical mastectomy for left breast cancer, especially in reducing the radiation dose and volume of the heart and lungs.

          Abstract

          摘要: 目的 研宄采用在射束方向视图 (BEV) 下部分切乳腺 (BEV 射野设计调强方法, B-IMRT) 的调强方法进行左乳 腺癌改良根治术后胸壁放疗的剂量学特点。 方法 对 2020 年 5 月 一2020 年 11 月在聊城市人民医院进行放疗的 13 例左乳腺癌改良根治术后患者, 分别用 BEV 射野设计调强方法 (B-IMRT) 和切线野调强方法 (T-IMRT) 进行计划设 计。比较 2 种计划在计划靶区的平均剂量、适形度指数、均匀性指数方面以及左侧肺、心脏的各项剂量体积参数上的 差异。 结果 B-IMRT 计划较 T-IMRT 计划在计划靶区的适形性和均匀性上均有所改善, 具有统计学差异 ( P < 0.05), 靶区平均剂量相近。B-IMRT 计划较 T-IMRT 计划在左侧肺的 V 5V 10V 20V 30D mean, 心脏的 V 5V 10V 30D mean 剂量 体积参数上均有所下降, 具有统计学差异 ( P < 0.05)。B-IMRT 计划较 T-IMRT 计划在患侧肺的 V 5 上减少了 T-IMRT 计划的 9.23%, V 10 上减少了 13.29%, V 20 上减少了 9.54%, V 30 上减少了 8.28%, D mean 上减少了 10.35%; 在心脏的 V 5 上减少了 T-IMRT 计划 27.62%, V 10 上减少了 29.72%, V 30 上减少了 21.45%, D mean 上减少了 24.88%。 结论 B-IMRT 计划较 T-IMRT 计划在靶区剂量的适形度 CI、均匀性 HI 上均有较好的剂量学优势 ( P < 0.05), 而且在降低心肺的 照射剂量和照射体积方面优势明显 ( P < 0.05)。

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          Author and article information

          Journal
          CJRH
          Chinese Journal of Radiological Health
          Chinese Preventive Medical Association (Ji’an, China )
          1004-714X
          01 June 2021
          01 September 2021
          : 30
          : 3
          : 258-263
          Affiliations
          [1] 1Department of Radiotherapy, Liaocheng Peoples Hospital, Liaocheng 252000 China
          Article
          j.issn.1004-714X.2021.03.003
          10.13491/j.issn.1004-714X.2021.03.003
          7bedbe88-3501-41de-ad5b-87d27865abeb
          © 2021 Chinese Journal of Radiological Health

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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          Categories
          Journal Article

          Medicine,Image processing,Radiology & Imaging,Bioinformatics & Computational biology,Health & Social care,Public health
          Modified Radical Mastectomy,Beam’s Eye View,Dosimetry,Breast Cancer

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