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张卓, 杨敏, 王东东, 陈显钊. 乳腺癌术后放疗体位固定技术的摆位误差及重复性分析[J]. 实用临床医药杂志, 2021, 25(8): 52-54, 59. DOI: 10.7619/jcmp.20210557
引用本文: 张卓, 杨敏, 王东东, 陈显钊. 乳腺癌术后放疗体位固定技术的摆位误差及重复性分析[J]. 实用临床医药杂志, 2021, 25(8): 52-54, 59. DOI: 10.7619/jcmp.20210557
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ZHANG Zhuo, YANG Min, WANG Dongdong, CHEN Xianzhao. Analysis in posture error and repeatability of fixed technology for postoperative radiotherapy position of breast cancer patients[J]. Journal of Clinical Medicine in Practice, 2021, 25(8): 52-54, 59. DOI: 10.7619/jcmp.20210557
Citation: ZHANG Zhuo, YANG Min, WANG Dongdong, CHEN Xianzhao. Analysis in posture error and repeatability of fixed technology for postoperative radiotherapy position of breast cancer patients[J]. Journal of Clinical Medicine in Practice, 2021, 25(8): 52-54, 59. DOI: 10.7619/jcmp.20210557
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乳腺癌术后放疗体位固定技术的摆位误差及重复性分析

Analysis in posture error and repeatability of fixed technology for postoperative radiotherapy position of breast cancer patients

    摘要
  • 摘要:
      目的  探讨真空袋及乳腺托架2种固定方式的摆位误差，并探讨真空袋用于乳腺癌全乳切除术后体位固定的可行性。
      方法  回顾性分析78例乳腺癌全乳腺切除术后放疗患者的临床资料，其中采用乳腺托架固定体位的患者42例（乳腺托架组），采用真空袋固定体位的患者36例（真空袋组）。根据患者配准误差结果，每周进行1~2次锥形束计算机断层扫描（CBCT）图像配准，采集右、左、进、退、升、降6个方向摆位误差的数据，并应用公式计算靶区外扩边界。
      结果  乳腺托架组在左、进、升3个方向的摆位误差分别为（0.34±0.24）、（-0.36±0.33）、（-0.44±0.29）cm，真空袋组分别为（0.26±0.27）、（-0.28±0.18）、（-0.29±0.20）cm。真空袋组摆位误差小于乳腺托架组，差异有统计学意义（P < 0.05）。乳腺托架组应用公式计算的右、左、进、退、升、降6个方向的外扩边界分别为0.40、0.49、0.81、1.21、0.62、0.70 cm，真空袋组分别为0.39、0.57、0.32、0.55、0.41、0.64 cm。
      结论  乳腺癌全乳切除术后放疗患者采用真空袋或乳腺托架均可满足临床需求，但采用真空袋进行体位固定误差更小，治疗精度更高。

     

    Abstract:
      Objective  To compare the positioning errors fixed by vacuum bag and breast bracket, and to explore the feasibility of vacuum bag in posture fixation for postoperative radiotherapy breast cancer patients with total mastectomy.
      Methods  Retrospective analysis of data of 78 postoperative radiotherapy patients with breast cancer was performed, including 42 patients with posture fixation by breast bracket (breast bracket group), and 36 patients using vacuum bag for body position fixation (vacuum bag group). Cone-beam computed tomograpgy(CBCT) image registrations were used for 1 time to 2 times per week during radiotherapy so as to obtain more accurate data. The right, left, forward, backward, up, down directions positioning errors were collected. And planning target volume margin was calculated by the formula.
      Results  The positioning errors of the breast bracket group in left, forward and up directions were (0.34±0.24), (-0.36±0.33), and (-0.44±0.29) cm, respectively, and were (0.26±0.27), (-0.28±0.18), (-0.29±0.20) cm, respectively in the vacuum bag group. The positioning error of the vacuum bag group was less than that of the breast carrier group (P < 0.05). The calculated planning target volume margin of the breast bracket group in right, left, forward, backward, up, down directions were 0.40, 0.49, 0.81, 1.21, 0.62, 0.70 cm, respectively, and 0.39, 0.57, 0.32, 0.55, 0.41, 0.64 cm, respectively in the vacuum bag group.
      Conclusion  For breast cancer patients with postoperative radiotherapy, vacuum bag and breast bracket can be both accepted in clinic, but vacuum bag has less positioning error and higher accuracy in treatment.

     

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