用锥形束CT图像测量放疗摆位误差

被引：87

作者：

许峰

柏森

王瑾

张洪

钟仁明

蒋晓芹

机构：

[1] 四川大学华西临床医学院华西医院放疗科

来源：

中华放射肿瘤学杂志 | 2007年 / 16卷 / 06期

关键词：

图像引导放疗; 断层摄影术X线,计算机; 锥形束; 摆位误差;

D O I：

暂无

中图分类号：

R730.5 [肿瘤治疗学];

学科分类号：

100214 [肿瘤学];

摘要：

目的探讨图像引导放疗(IGRT)系统的临床摆位误差。方法应用医科达SynergyTM系统治疗51例,其中头颈部肿瘤19例,胸部肿瘤25例,腹、盆部肿瘤7例。每次照射前获取X线容积图像(XVI)即锥形束断层扫描(CBCT),将CBCT图像和计划CT图像及其靶中心匹配,获得靶中心x、y、z方向的误差,分析误差及其分布规律。结果CBCT图像对比度好,临床上能清楚显示肿瘤大小、位置及其和周围的关系。51例每次治疗开始前的CBCT共955次,分别分析头颈部、胸部及腹、盆部摆位误差,均呈正态分布。系统误差(均数)±随机误差(标准差)在x、y、z方向分别为头颈部(- 0.3±1.5)、(-0.3±1.6)、(0±1.3)mm,胸部(-0.6±2.9)、(-0.2±5.6)、(0.7±3.2)mm,腹、盆部(-0.8±2.1)、(-0.3±5.9)、(0.1±2.6)mm。结论通过CBCT测量治疗前摆位误差并实时调整摆位误差,可大大提高患者摆位精度,同时为正确设定计划靶体积(PTV)提供了依据。

引用

页码：461 / 464

页数：4

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