乳腺癌保乳术后调强放疗两种标记法的比较

Comparison of Two Marking Methods in Intensity Modulated Radiation Therapy for Breast Cancer Conserving Surgery

目的比较乳腺癌保乳术后调强放射治疗两种体膜标记法的误差值,以选择出更好的提高摆位精度的标记法。方法随机将乳腺癌保乳术后患者分为体膜开窗组和不开窗组,各13例,所有病人在调强放疗前通过椎体素CT(CBCT)进行摆位验证,比较两组摆位误差值。结果摆位误差在左右、头脚、腹背3个方向不开窗法为:(3.800±0.895)mm、(3.200±0.927)mm、(2.900±0.872)mm;开窗法为:(2.100±0.639)mm、(1.300±0.826)mm、(1.500±0.574)mm。两组差异有统计学意义(P<0.05)。结论体膜开窗标记法减小了摆位误差,提高了放射治疗摆位重复性和精度。

Objective To compare two body membrane error of marker methods in intensity-modulated therapy for breast cancer conserving surgery.And select the better improve the accuracy of the marker methods.Methods The patients of breast cancer conserving surgery using body membrane were randomly divided into windowing groups and without windowing groups,each in 13,all patients intensity-modulated radiotherapy treatment to put a CBCT via before validation,compared with two groups put an error data.Results Set-up error in the left-right,head-foot and belly-back in three direction without window method for：（3.8±0.895）mm,（3.2±0.927）mm,（2.9±0.872）mm,window method for：（2.1±0.639）mm,（1.3 ±0.826） mm,（1.5±0.574）mm.Two groups was statistically significant difference（P0.05）。Conclusion Body membrane method with windowing mark reduces setup error,improved the radiation therapy for repeatability and accuracy of a pendulum.