摘要
目的评价CT共轨技术在鼻咽癌调强放射治疗中的应用价值。方法应用西门子CTVision系统的扇形束CT(SOMATOMOPEN CT),对27例鼻咽癌调强放疗患者,在每次照射前摆位后获取CT图像,通过系统自带的匹配功能,将获取的CT图像与计划CT图像匹配,获得患者X(左右)、Y(头脚)、Z(前后)3个方向偏移中心点的线性摆位误差,通过移床在线进行误差校正。结果 27例患者共进行CT扫描110次,X、Y、Z三方向位移偏差值为(-0.16±1.68)、(0.25±1.66)、(0.33±1.09)mm。结论 CT共轨技术能精确快速测量患者体位和靶区位置空间误差,可改善鼻咽癌调强放疗的摆位精度。
Objective To evaluate the value of CT common rail technique for application in intensity-modulated radiotherapy for nasopharyngeal cardnoma （NPC）. Methods Twenty-seven NPC patients underwent Somatom CT scans using the Siemens CTVision system prior to the commencement of the radiotherapy sessions. The acquired CT images were registered with the planning CT images using the matching function of the system to obtain the linear set-up errors of 3 directions, namely X （left to right）, Y （superior to inferior）, and Z （anterior to posterior）. The errors were then corrected online on the moving couch. Results The 27 NPC patients underwent a total of 110 CT scans and the displacement deviations of the X, Y and Z directions were -0.16±1.68 mm, 0.25±1.66 mm, and 0.33±1.09 mm, respectively. Conclusion CT common rail technique can accurately and rapidly measure the space error between the posture and the target area to improve the set-up precision of intensity-modulated radiotherapy for NPC.
出处
《南方医科大学学报》
CAS
CSCD
北大核心
2012年第11期1655-1657,1662,共4页
Journal of Southern Medical University
基金
广西自治区科技计划项目(201140003B-84)
广东省科技计划项目(2010B031100013)
关键词
CT共轨技术
鼻咽癌
在线校位
摆位误差纠正
CT common rail technology
nasopharyngeal carcinoma
online correction
setup error correction
