乳腺癌胸壁电子线体表野轮廓描绘架设计制作和应用

Manufacturing and Applying of Electronic Field Contouring Facility for Breast Cancer Patients

目的:乳腺癌术后胸壁常不平整,以往的铅挡方式无法满足临床要求,笔者仿造加速器限光筒的构造制作出描绘架,用于电子线野轮廓的勾画用于制作铅挡。方法:根据电子线限光筒的构造制作描绘架,在西门子常规模拟机下使用在各个机架角度验证描绘架的勾画的精度。分别使用传统方法和使用描绘架进行体表野轮廓的勾画制作出铅挡进行精度分析,并在实际300多例胸壁野铅挡的制作过程中使用描绘架勾画靶区。结果:使用描绘架勾画的靶区制作出的铅挡误差均小于2 mm符合临床要求。结论:描绘架的使用给模室工作带来了方便,降低了摆位误差,提高放射治疗工作效率,值得推广。

Objective: The conventional block technique can not meet the clinical requirement for the ieeegular chest wall always becomes irregular because of surgery.This work introduced a contour facility by simulating the accelerator collimator for contouring electronic field shape.Methods: A contour facility was made by mimicking electronic collimator.Various gantry angles were used to test the precision of this contour facility in Siemens simulator.The precision of two blocks which were made by either conventional method or this contour facility were compared.This technique was applied in more than 300 chest wall cases with this contour facility.Results: The setup error was less than 2mm if this contour facility was used.Conclusions: This contour facility is a convenience tool which can reduce setup error and enhance efficiency in block mold making.