兆伏级CT对胸腹段肿瘤放射治疗影响与提高治疗精度因素的研究

发布时间：2018-06-09 06:33

本文选题：螺旋断层放射治疗 + 图像配准　；参考：《中国医学装备》2017年04期

【摘要】：目的:运用高能X射线计算机体层摄影(MVCT)图像引导对胸腹部肿瘤螺旋断层放射治疗摆位误差进行评估,分析影响摆位精度的因素,提高临床放射治疗精度。方法:随机选取40例胸腹部肿瘤根治患者病例,通过MVCT图像引导下自动配准结合手工配准后所得到的1218组摆位误差数据与分布频次,分析减少临床摆位误差的方法,改进和提高放射治疗精度的流程规范。结果:通过计算可以得出系统误差±随机误差在X轴、Y轴及Z轴方向上分别为(1.43±1.24)mm、(5.12±1.41)mm及(1.55±1.18)mm,最终手动参与配准执行后为(1.36±1.18)mm、(5.02±1.35)mm及(1.46±1.12)mm。Y轴方向平均误差最大,其次是Z轴方向,X轴方向的平均误差最小。结论:胸腹部肿瘤摆位误差较大,但通过配准可以量化地减少摆位误差,经分析放射治疗流程中产生误差环节,总结有效提高摆位精度的方法,为精确放射治疗提供必要的质量保证。
[Abstract]:Objective: to evaluate the positioning error of thoracic and abdominal tumors by spiral tomography with high energy X-ray computed tomography (MVCT) images, and to analyze the factors that affect the accuracy of radiotherapy and to improve the accuracy of clinical radiotherapy. Methods: forty patients with thoracic and abdominal cancer were randomly selected. 1218 groups of error data and distribution frequency were obtained by automatic registration and manual registration under the guidance of MVCT images, and the methods to reduce the errors of clinical pendulum were analyzed. To improve and improve the accuracy of radiotherapy procedures. Results: the systematic error 卤random error in X axis Y axis and Z axis direction were 1.43 卤1.24 mm and 5.12 卤1.55 卤1.18 mm respectively, and the average errors were 1.36 卤1.18 mm 卤5.02 卤1.35)mm and 1.46 卤1.12 mm 路Y axis after manual operation. Secondly, the average error of Z axis direction and X axis direction is minimum. Conclusion: the positioning error of chest and abdomen tumor is large, but the error of pendulum can be reduced quantitatively by registration. The methods of improving the accuracy of pendulum can be summarized by analyzing the error link in radiation therapy process. Provide necessary quality assurance for accurate radiotherapy.
【作者单位】：广州总医院肿瘤科;广州总医院医学工程科;
【分类号】：R730.55

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