医疗卫生装备2011，Vol.32Issue(10)：84-85,2.
基于CTVision扫描分析鼻咽癌放疗摆位误差
Analysis of Set-up Error in Nasopharyngeal Carcinoma Radiotherapy Based on CTVision Scan
甘晓根 1徐子海 1廖福锡1
作者信息
- 1. 530021南宁 解放军303医院放疗中心
- 折叠
摘要
Abstract
Objective To study the role of CTVision on the geometrical accuracy of IMRT of nasopharyngeal carcinoma to calculate CTV referential safety margins of PTV. Methods Immobilization and alignment were performed by conventional head-and-neck masking and laser alignment for daily positioning with the Siemens CTVision system. All patients had received kilo-voltage computed tomography (KV-CT) before radiotherapy was delivered. The set-up error of isocenter position on x, y, z was obtained by matching KV-CT and plan CT images. The patient setup was then corrected by moving the couch accordingly. Results According to 88 KV-CT scans, the systemic±random error on x, y, z directions were (-0.56± 1.65)mm, (-0.22±2.90)mm and (-0.45±1.89)mm. All errors were less than 3mm. Conclusion Based on this data,there is some extent of setup error in nasopharyngeal carcinoma 3D CRT or IMRT. The approach based on the CTVision measurements can be used to reduce the impact of setup error obviously and to estimate the required margins for PTV. [Chinese Medical Equipment Journal,2011,32(10):84-85]关键词
鼻咽癌/摆位误差/CTVision/计划靶区Key words
nasopharyngeal carcinoma/ setup error/ CTVision/ planning target volume分类
医药卫生引用本文复制引用
甘晓根,徐子海,廖福锡..基于CTVision扫描分析鼻咽癌放疗摆位误差[J].医疗卫生装备,2011,32(10):84-85,2.
