摘要
目的分析宫颈瘤三维适形放疗时的摆位误差。方法利用双曝光照相技术拍摄验证片,将验证片与计划系统所生成的数字重建图像(DRR)对比,测量和分析验证片与DRR之间的误差。结果各方向摆位误差的分布均近似正态分布,宫颈癌患者的摆位误差主要发生在患者左右和头足方向。结论利用双曝光照相技术拍摄验证片可以有效减少摆位的误差,提高摆位的准确性。
Objective To study the set-up error during conformal radiotherapy for patients with cervical cancer. Mothods The verification films using of double-exposure photography shooting film compared with digitally reconstruted radio- graph （DRR）, The deviation of set-up for patients in the left-right （X）, anterior-posterior （Y） and superior-inferior （Z） di- rections were measured and analyzed. Results The distribution of set-up errors in every direction approximated a normal dis- tribution. The set-up deviations occurred mainly in x and z directions. Conclusion The using of double-exposure photography shooting film can effectively reduce the set-up error and improve the accuracy of positioning.
出处
《广州医药》
2009年第6期10-11,共2页
Guangzhou Medical Journal
关键词
宫颈癌
双曝光照相技术
摆位误差
Cervial cancer
Double-exposure photography
Set-up error
