Unity MR加速器临床应用各阶段时间统计分析

doi:10.3760/cma.j.cn113030-20210830-00332

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摘要目的探索Unity MR加速器放疗系统在临床应用中各阶段的时间特征,为临床优化流程时间提供参考。方法回顾性研究使用Unity MR加速器治疗的患者55例,根据治疗计划方式分为位置自适应(ATP)和形状自适应(ATS)两组,统计对比两种治疗流程中各阶段所需时间、各部位的扫描序列名称和序列所需时长、计划射野数、子野数及跳数。此外,按治疗部位不同统计摆位时间。两种流程各分步时间及各部位摆位时间的结果采用中位数M (Q₁, Q₃)方式描述,各计划的子野数、射野数及跳数采用Mean±SD方式描述。结果行ATP治疗流程42例,共计305治疗分次:摆位、MR扫描、配准、自适应计划、出束、总时间分别为3(2, 5)、5(4, 7)、3(3, 4)、8(4, 12)、8(6,11)、30(25, 36) min;行ATS治疗流程13例,共计65治疗分次:摆位、MR扫描、配准、靶区及OAR勾画、自适应计划、出束、总时间分别为2(2, 3)、7(5, 8)、4(3, 5)、12(9,16)、11(10,14)、10(9,11)、55(49,61) min。按治疗部位统计摆位时间:头颈、胸、腹部分别为4(2, 4)、2(2, 4)、3(2, 5) min;行ATP各计划的子野数、射野数及跳数分别为:头颈部8.1±1.7、49.9±31.2、846.75±363.44 MU,胸部8.0±2.0、60.7±13.3、790.21±279.00 MU,腹部9.7±2.0、81.2±22.3、2007.32±1053.81 MU;行ATS计划的子野数、射野数及跳数分别为:头颈部(仅1例)13、39、993.07 MU,腹部9.5±1.5、65.5±6.3、2763.26±835.41 MU。结论 MR引导放疗具有较大临床应用潜力,目前整体治疗时间较长,但仍有改进的空间。

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	孙莹莹
	洪天航
	王宏
	李盛蓝
	田源
	郇福奎
	覃仕瑞

关键词 ：磁共振加速器, 磁共振引导放疗, 自适应放疗, 治疗时间

Abstract：Objective To analyze the duration of each phase of Unity MR-linac in clinical application,aiming to provide reference for clinical optimization of the process time. Methods Clinical data of 55 patients treated with Unity MR-linac were retrospectively analyzed. All patients were divided into the adapt to position (ATP) and adapt to shape (ATS) groups according to the planning method. The duration of each phase in the treatment process, the name and the time of each sequence, the number of beams, segments and total monitor units (MUs) were recorded and compared between two groups. In addition, the set-up time was counted according to different treatment sites. The time of each sequence and set-up time were expressed as the median M (Q₁, Q₃), and the number of beams, segments and total MUs of each plan were described as the mean±SD. Results 42 patients underwent ATP with a total of 305 treatment sessions:setup time was 3(2, 5) min, MR scanning time was 5(4, 7) min, registration time was 3(3, 4) min, adaptive planning time was 8(4, 12) min, beam on time was 8(6, 11) min, and the total time was 30(25, 36) min. 13 patients received ATS with a total of 65 treatment sessions:setup time was 2(2, 3) min, MR scanning time was 7(5, 8) min,registration time was 4(3, 5) min, time of delineation of target and organs at risk was 12(9,16) min, adaptive planning time was 11(10,14) min, beam on time was 10(9,11) min and the total time was 55(49,61) min. The set-up time according to treatment sites was 4(2, 4) min in the head and neck, 2(2, 4) min in the chest, and 3(2, 5) min in the abdomen. The number of fields, segments and total MUs during ATP were 8.1±1.7, 49.9±31.2, 846.75±363.44 in the head and neck, 8.0±2.0, 60.7±13.3, 790.21±279.00 in the chest, and 9.7±2.0, 81.2±22.3, 2007.32±1053.81 in the abdomen, respectively. The number of fields, segments and total MUs during ATS in head and neck of one case were 13, 39, 993.07, and 9.5±1.5, 65.5±6.3, 2763.26±835.41 in the abdomen. Conclusions MR-guided radiotherapy yields huge potential in clinical application. However, there is still much room for the improvement of shortening the process duration.

Key words： Magnetic resonance linac MR-guided radiotherapy Adaptive radiotherapy Treatment time

收稿日期: 2021-08-30

通讯作者: 覃仕瑞,Email:shiruiok@126.com

引用本文:

孙莹莹,洪天航,王宏等. Unity MR加速器临床应用各阶段时间统计分析[J]. 中华放射肿瘤学杂志, 2022, 31(6): 550-555.

Sun Yingying,Hong Tianhang,Wang Hong et al. Statistical analysis of duration of each phase of Unity MR-linac in clinical application[J]. Chinese Journal of Radiation Oncology, 2022, 31(6): 550-555.

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http://journal12.magtechjournal.com/Jweb_fszlx/CN/10.3760/cma.j.cn113030-20210830-00332 或 http://journal12.magtechjournal.com/Jweb_fszlx/CN/Y2022/V31/I6/550

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