锥形束CT扫描分析调强放射治疗中的摆位误差

发布时间：2018-05-31 00:23

本文选题：CBCT扫描 + 摆位误差　；参考：《中国老年学杂志》2013年03期

【摘要】：目的调强放疗(IMRT)治疗前行CBCT扫描,分析摆位误差,为确定IMRT放疗计划中CTV外放PTV提供依据。方法应用VrianIX-4702加速器对121例肿瘤患者进行调强放射治疗,每位患者首次治疗前均行CBCT,以后每周进行1次CBCT,记录不同部位肿瘤在左右(X)、前后(Y)、头脚(Z)3个方向上的平移差值数据,计算并分析首次摆位误差。结果头颈部肿瘤X、Y、Z三个方向上的首次摆位误差分别为:(0.046±0.183)cm、(0.052±0.153)cm、(0.021±0.163)cm;盆腔肿瘤X、Y、Z三个方向上的首次摆位误差分别为:(-0.040±0.300)cm、(0.183±0.291)cm、(-0.078±0.376)cm。结论通过本组CBCT扫描所得摆位误差分析,推荐IMRT时头颈部肿瘤CTV外放PTV(margin)为3个方向上均为3 mm;盆腔肿瘤margin为X、Y方向上为6 mm,Z方向上为7 mm。
[Abstract]:Objective to analyze the positioning error of CBCT scan before IMRT treatment and to provide the basis for determining CTV PTV in IMRT radiotherapy plan. Methods 121 patients with tumor were treated by intensity modulated radiotherapy with VrianIX-4702 accelerator. Each patient was given CBCTs before the first treatment and once a week thereafter. The error of the first pendulum is calculated and analyzed. Results the error of the first pendulum in the three directions of head and neck tumors was 0.046 卤0.183 cm ~ (-1) and 0.021 卤0.163 cm ~ (-1) in the three directions of X ~ (+) Y ~ + Z, respectively, and 0.183 卤0.291 cm ~ (-1) cm ~ (- 0.078 卤0.376cm ~ (-1) in the three directions of X _ (1) Y ~ (+) Z for pelvic tumors. The results showed that the error of the first pendulum was 0.183 卤0.291 cm ~ (-1) for the tumor of head and neck, and the error was 0.021 卤0.163 cm ~ (-1) for the tumor of the pelvis respectively. Conclusion according to the error analysis of CBCT scanning, it is recommended that the CTV margin of head and neck tumors is 3 mm in three directions and 7 mm in margin of pelvic tumors in XY direction and 6 mm / Z direction in IMRT.
【作者单位】：吉林大学第二医院放疗科;
【分类号】：R730.55

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