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目的:利用锥形束CT(CBCT)验证对进行放射治疗的食管癌患者在每次摆位过程中的误差进行分析,为医生勾画靶区时从临床靶区(CTV)外扩到计划靶区(PTV)所需的距离提供参考数据。方法:对我科治疗的43例食管癌患者进行CBCT验证,对摆位误差进行分析。结果:根据摆位误差数据计算,食管上段肿瘤外扩大小为2.6~3.9 mm,食管中下段肿瘤外扩大小为2.9~4.7 mm。结论:摆位误差在医生勾画靶区时CTV外扩到PTV的距离范围内。
OBJECTIVE: To verify the accuracy of cone beam computed tomography (CBCT) in detecting esophageal cancer patients during each setup, and to expand the scope of the target from outside the clinical target (CTV) (PTV) the distance required to provide reference data. Methods: CBCT was performed in 43 cases of esophageal cancer treated by our department, and the error of setup was analyzed. Results: According to the setup error data, the size of the upper esophagus was 2.6-3.9 mm and the size of the middle and lower esophagus was 2.9-4.7 mm. CONCLUSION: The setup error is within the distance of CTV outside PTV when the doctor draws the target.