| 邢宝继 陈林 郭汝涛 刘世伟 冉浩男.应用KV-CBCT分析鼻咽癌调强放射治疗的摆位误差[J].,2014,14(35):6953-6955 |
| 应用KV-CBCT分析鼻咽癌调强放射治疗的摆位误差 |
| Setup Error in IntensityModulated Radiotherapy for NasopharyngealCarcinoma by Kilo-Volt Cone-BeamComputed Tomography |
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| DOI： |
| 中文关键词: 鼻咽癌 KV-CBCT 调强放射治疗 摆位误差 |
| 英文关键词: Nasopharyngeal carcinoma(NPC) KV-CBCT Intensity Modulated Radiotherapy(IMRT) Setup error |
| 基金项目: |
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| 中文摘要: |
| 目的：应用KV-CBCT 分析鼻咽癌调强放射治疗时的摆位误差，为鼻咽癌调强放射治疗计划设计时CTV 外扩PTV 边界的
大小提供参考。方法：选取30 例IMRT 的鼻咽癌患者，治疗过程中每周一次应用KV-CBCT 采集患者治疗前的CT 图像，将所得
图像与定位CT 图像进行匹配，分别测定X、Y、Z轴三个方向的摆位误差。结果：30 例患者共拍摄168 次KV-CBCT，获得168 组
摆位误差结果，群体摆位误差分别为X 轴-0.15± 1.43 mm，Y 轴0.20± 1.58 mm，Z轴-0.21± 1.65 mm；根据Van Herk 公式计算得
到各方向的CTV-PTV外放边界值X、Y、Z轴分别为3.1 mm、3.3 mm和3.4 mm。结论：应用KV-CBCT 影像系统可实时测量摆位
误差并在线进行纠正，减小摆位误差，为CTV-PTV外放边界提供参考。 |
| 英文摘要: |
| Objective:To analyze the setup errors by KV-CBCT in nasopharyngeal carcinoma treated with Intensity Modulated
Radiotherapy to provide the reference for calculate safety margins of PTV with CTV.Methods:30 patients with nasopharyngeal
carcinoma who had received kilovoltage cone-beam computed tomography (KV-CBCT) and treated with IMRT were selected. The
acquired images of KV-CBCT were compared to establish CT images with calculated setup errors of X-axis, Y-axis and Z-axis.Results:All the patients received the 168 KV-CBCT scans. The overall setup errors were below -0.15± 1.43 mm in X-axis, 0.20± 1.58 mm in
Y-axis and -0.21± 1.65 mm in Z-axis; The margins required for CTV-PTV were calculated 3.1 mm, 3.3 mm and 3.4 mm, respectively,
according to the Van Herk formula.Conclusion:The application of KV-CBCT imaging system on the margin of CTV-PTV can measure
and reduce the setup errors by correcting online. |
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