摘要
目的验证源皮距法保证头部肿瘤患者精确摆位的可行性。方法使用Varian Acuity8.6模拟机对21例头部肿瘤病人拍片,并从治疗计划系统中得到相应位置的标准射野数字重建(DRR)图像,应用Acuity的二维匹配功能,得出摆位误差;观察其与射野角度为0°.45°.315°时源皮距误差的对应关系。结果21例患者左右、头脚、前后方向系统误差分别为(1.1±1.6)mm、(0.7±1.2)mm、(0.9±1.5)mm,随机误差分别为(1.51±3.1)mm、(1.05±3.3)mm、(1.60±2.3)mm。各角度源皮距系统误差为(1.25±1.3)mm、(1.04±1.3)mm、(1.10±2.3)mm,随机误差为(2.03±1.7)mm、(2.81±2.3)mm、(2.33±3.0)mm。结论源皮距法简易可行,可以作为其他位置验证手段的辅助。
Objective To verify the feasibility of setup error verification by observing patents＇ source-skin distance（SSD） for patients of head tumor. Methods Films for 21 patients with head tumor were recorded using simulator （Varian Acuity8.6）, and comparison with reference digitally reconstructed radiograph （DRR） from Treatment plan system （TPS）. The deviation of setup for 21 patients in the left-right, anterior-posterior and superior-inferior directions were measured by using 2D match, and SSD error was recorded when gantry angle was 0°, 45°, 315°. Then setup error and corresponding SSD error were analyzed. Results The systematic errors and random errors of 21 patients in the left-right, anterior-posterior and superior-inferior directions were （1.1 ± 1.6）mm, （0.7± 1.2）mm, （0.9 ± 1.5）mm and （ 1.51 ± 3.1 ） mm, （1.05± 3.3） mm, （1.60 ±2.3）mm .The systematic SSD errors and random SSD errors were （1.25 ± 1.3）mm （1.04 ± 1.3）mm, （1.10±2.3）mm, and （2.03± 1.7）mm, （2.81 ±2.3）mm, （2.33±3.0）mm for gantry angle was 0°, 45° 315°,respectively. Conclusions It is simple and feasible for setup error verification by observing patients＇ SSD and can be auxiliary to other verification means.
出处
《中国医疗器械杂志》
CAS
2010年第1期60-61,共2页
Chinese Journal of Medical Instrumentation
关键词
头部肿瘤
放射治疗
摆位误差
源皮距
head tumor, radiotherapy, setup error, source-skin distance
作者简介
崔恩萍，主管技师，E-mail：tanghong92500@yahoo．com．cn
