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目的:分析锁骨上野预防性放疗射线选择的优劣。方法:调研鼻咽癌和乳腺癌患者锁骨上野预防性放疗选择射线的现状,并利用三维治疗计划系统(3D-TPS)的剂量分布截面图和剂量体积直方图(DHV),评估靶区内的平均剂量、靶区内剂量的均匀性、靶区内的最小剂量、危及器官最高剂量、治疗区与靶区的适合度。结果:①120例鼻咽癌选用射线:单纯8MV X射线56%、单纯~(60)Co为40%、~(60)Co+电子线为0%、单纯电子线为0%;70例乳腺癌选用射线:单纯8MV X射线为0%、单纯~(60)Co为18%、~(60)Co+电子线为64%、单纯电子线为17%;②本文9种射线的5项物理指标综合评估结果表明,单纯电子线或~(60)Co+电子线优点最多,而单纯8MV X射线或单纯6MV X射线的缺点最多。结论:目前部分放疗单位对锁骨上野预防性放疗射线的选用存在不合理之处,有必要进一步提高认识和加以修正。
Objective: To analyze the advantages and disadvantages of preventive radiotherapy for supraclavicular aorta. Methods: We investigated the status of selected radiotherapy for supraclavicular preconditioning radiation in patients with nasopharyngeal and breast cancers. The dose distribution histograms and dose-volume histograms (3D-TPS) Average dose, uniformity of dose within the target zone, minimum dose within the target zone, highest dose of organ at risk, fitness of the treatment zone to the target zone. Results: ①120 cases of nasopharyngeal carcinoma selected radiation: pure 8MV X-ray 56%, simple ~ (60) Co 40%, ~ (60) Co + 0% electron beam, pure electron beam 0%; 70 cases of breast cancer selection Ray: 0% for pure 8MV X-ray, 18% for pure 60Co, 64% for 60Co + electron and 17% for pure electron. The comprehensive evaluation of 5 physical indexes The results show that pure electron or ~ (60) Co + electron has the most advantages, while the disadvantages of pure 8MV X-ray or pure 6MV X-ray are the most. Conclusions: At present, some radiotherapy units have unreasonable use of the preventive radiotherapy radiation on the supraclavicular aorta. It is necessary to further raise awareness and correct it.