目的:探讨乳腺托架在肺癌患者放疗体位固定中的作用。方法:选择60例需放疗肺癌患者,分两组,每组30例:第一组患者采用常规定位,直接睡在定位床上;第二组患者躺在乳腺托架上定位。治疗前摆位要求:患者皮肤上3个标记点“+”与机房内激光线重合,治疗后,测量和计算两组患者身体3个标记点“+”与激光线间位移误差。结果:第一组肺癌患者体位的位移误差比第二组大,体位重复性差。结论:乳腺托架的使用可解决肺癌患者体位固定问题,满足放疗“三精”原则。 Objective: To investigate the role of breast brackets in radiotherapy of lung cancer patients. Methods: Sixty patients with lung cancer undergoing radiotherapy were selected and divided into two groups of 30 patients in each group. The patients in the first group were placed in the bed directly and the second group were located in the breast brackets. Pre-treatment setup requirements: 3 marked points on the patient’s skin “+” coincide with the laser line in the engine room, after treatment, measurement and calculation of three groups of patients in the two groups of points “+ ” and the laser line displacement error . Results: The displacement error of the first group of lung cancer patients was larger than that of the second group, and the position repeatability was poor. Conclusion: The use of breast brackets can solve the problem of fixed position of lung cancer patients, to meet the principle of radiotherapy “three fine ”.