应用锥形束CT验证食管癌患者放射治疗时的摆位误差  

Analysis of setup errors for patients with esophageal carcinoma using CBCT

作　　者：秦伟[1] 陈飞[1] 陈成[1] 陈丽丽[1] 沈恩龙[1] 茹正兴[1] 刘莹[1] 时飞跃[1] 陈锦飞[1] 

机构地区：[1]南京医科大学附属南京医院肿瘤放疗中心,江苏南京210006

出　　处：《现代医学》2014年第9期980-982,共3页Modern Medical Journal

摘　　要：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 analyze setup errors during patient positioning by using cone-beam computed tomography（ CBCT） scans,which provide reference data for safety margins from clinical target volume（ CTV） to planning target volume（ PTV）,when oncologists delineate target volumes. Methods： CBCT scans have been carried out for 43 patients with esophageal carcinoma,and corresponding setup errors have been acquired and analyzed. Results： The external expansion for upper segment esophageal carcinoma was 2. 6-3. 9 mm,and that for middle and lower esophageal carcinoma was 2. 9-4. 7 mm. Conclusion： The setup errors are within the safety margins from CTV to PTV,when oncologists delineate target volumes.

关 键 词：锥形束CT 食管癌 误差分析 放射治疗 

分 类 号：R735.1[医药卫生—肿瘤] R730.55[医药卫生—临床医学]