[1]刘园源,蔡永林.鼻咽癌调强放射治疗中心点Y轴精度分析[J].中国医学物理学杂志,2020,37(8):955-957.[doi:DOI:10.3969/j.issn.1005-202X.2020.08.003]
　LIU Yuanyuan,CAI Yonglin.Y-axis accuracy based on the center point of radiotherapy for nasopharyngeal carcinoma[J].Chinese Journal of Medical Physics,2020,37(8):955-957.[doi:DOI:10.3969/j.issn.1005-202X.2020.08.003]
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鼻咽癌调强放射治疗中心点Y轴精度分析()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
37
期数:
2020年第8期
页码:
955-957
栏目:
医学放射物理
出版日期:
2020-08-27

文章信息/Info

Title:
Y-axis accuracy based on the center point of radiotherapy for nasopharyngeal carcinoma
文章编号:
1005-202X（2020）08-0955-03
作者:
刘园源1; 蔡永林2
1.梧州市红十字会医院放疗一区， 广西 梧州 543002；2.梧州市红十字会医院检验科， 广西 梧州 543002
Author(s):
LIU Yuanyuan1;  CAI Yonglin2
1. the First Radiotherapy District, Wuzhou Red Cross Hospital, Wuzhou 543002, China 2. Department of Laboratory, Wuzhou Red Cross Hospital, Wuzhou 543002, China
关键词:
鼻咽癌; 调强放射治疗; 治疗中心点; Y轴精度
Keywords:
Keywords: nasopharyngeal carcinoma intensity-modulated radiotherapy treatment center Y-axis accuracy
分类号:
R739.6；R811.1
DOI:
DOI:10.3969/j.issn.1005-202X.2020.08.003
文献标志码:
A
摘要:
目的：分析鼻咽癌（NPC）调强放射治疗中心点Y轴的精度情况。方法：选取200例NPC患者为观察对象，将其随机分为A、B两组，每组100例。A组采用双弧容积旋转调强放射治疗（VMAT）逆向优化设计，B组采用传统的调强放射治疗（IMRT）逆向优化设计，两组均采用Eclipse13.5计划系统进行优化设计。比较两组优化设计放疗中心点与重建放射图像中心点Y轴精度情况。结果：A组Y轴移动的发生率为43.00%，B组为58.00%，A组低于B组（P<0.05）。A组Y轴移动的方向向下移动的占比为53.49%，B组Y轴移动方向向上移动占比为68.97%。在摆位误差方面，A组上移摆位误差为（1.07±1.01） mm，B组为（2.15±1.38） mm，A组下移摆位误差为（1.12±1.13） mm，B组为（2.07±1.24） mm，A组均低于B组（P<0.05）。在治疗中心点1层，A组占比为38.00%，B组占比为44.00%，两组无统计学差异（P>0.05）。在治疗中心点2层，A组占比为62.00%，B组占比为56.00%，两组无统计学差异（P>0.05）。中心点层数移动方面，A组移动主要发生在2层，发生率为69.35%。B组1层移动的发生率为36.36%，2层移动的发生率为75.00%。位于治疗中心点1层，B组的移动方向主要是向上移动。位于治疗中心点2层，A组上移的发生率为46.51%，下移的发生率为53.49%。B组在这一层中，主要是上移，发生率为51.72%。结论：NPC调强放射治疗过程中，采用VMAT逆向优化设计更具优势，能够提高调强放射治疗过程中治疗中心点Y轴的精度，具有应用和推广价值。
Abstract:
Abstract: Objective To analyze the Y-axis precision based on the center point of radiotherapy for nasopharyngeal carcinoma (NPC). Methods A total of 200 NPC patients were enrolled and randomly divided into groups A and B, with 100 cases in each group. Double-arc volumetric modulated arc therapy (VMAT) reverse optimization was adopted in group A, while traditional intensity-modulated radiotherapy reverse optimization was adopted in group B. Eclipse13.5 planning system was used for optimization design in two groups. Y-axis accuracy was analyzed based on the center point of optimized radiotherapy and that in reconstruction images. Results The incidence of Y-axis movement in group A was 43.00%, lower than 58.00% in group B (P<0.05). The direction of Y-axis movement in group A was downward, accounting for 53.49%, while the Y-axis in group B was moved upward, accounting for 68.97%. The positioning errors (moving upward) were (1.07±1.01) mm and (2.15±1.38) mm in group A and group B, and the positioning errors (moving downward) were (1.12±1.13) mm and (2.07±1.24) mm in group A and group B (P<0.05). The proportions of treatment center located at layer 1 were 38.00% and 44.00% in group A and group B, respectively, without statistical differences (P>0.05) and the proportions of treatment center located at layer 2 were 62.00% and 56.00%, respectively, without statistical differences (P>0.05). The center point movement in group A mainly occurred at layer 2, with an incidence of 69.35%. The incidence of the center point movement in group B was 36.36% at layer 1 and 75.00% at layer 2. The center point located at layer 1 in group B was mainly moved upward. The incidences of upward movement and downward movement of center point located at layer 2 were 46.51% and 53.49% in group A, and the movement of center point located at the layer 2 in group B was mainly moved upward, with an incidence of 51.72%. Conclusion During the radiotherapy for NPC, VMAT reverse optimization has more advantages and can improve the accuracy of Y-axis of the treatment center during radiotherapy, which is worthy of application and promotion.

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备注/Memo

备注/Memo:
【收稿日期】2020-02-11 【基金项目】国家自然科学基金（81860601） 【作者简介】刘园源，主治医师，研究方向：鼻咽癌放化疗，E-mail: xy2014121403@163.com
更新日期/Last Update: 2020-08-27