论文部分内容阅读
目的:利用 TPS 分析探讨乳腺癌保乳术后不同厚度乳房的照射方式及剂量分布特点。方法:选取乳房厚度为2cm、3cm 和4cm 的女性胸部 CT 片各一份作为分析对象,分析6MVX 线切线野和14Mev 电子线对乳房放疗的剂量分布特点和对同侧肺组织保护的情况。结果:乳房厚度≤3cm 的患者,采用14Mev 电子线照射比6MVX 线切线照射的剂量分布好,80%等量线包括的肺组织少;而乳房厚度>4cm 的患者14Mev 电子线照射80%等量线不能包括整个靶区,而6MVX 线切线照射的剂量分布更好些。结论:乳房厚度≤3cm 的患者保乳术后乳房的放疗采用14Mev 电子线垂直照射剂量分布更好,乳房厚度≥4cm 的采用6MVX 线切线野照射的剂量分布更合理。
Objective: To investigate the radiation patterns and dose distribution characteristics of breasts with different thickness after breast-conserving surgery by TPS analysis. Methods: One breast CT scan of 2 cm, 3 cm and 4 cm in breast was taken as the object of analysis. The dose distribution characteristics of 6MVX line and 14Mev electron beam on breast radiotherapy and the protection of ipsilateral lung tissue were analyzed. RESULTS: In patients with breast thickness ≤3 cm, dose distribution was better with 14 Mev electron beam than with 6 MVX line, and 80% isodomain included less lung tissue. In patients with breast thickness> 4 cm, the dose of 14 MeV electron beam was 80% The line can not include the entire target area, and the dose distribution of 6MVX line tangent irradiation is better. Conclusion: The radiation dose of 14Mev electron beam is better in patients with breast thickness less than 3cm, and the dose distribution of 6MVX line with more than 4cm in breast thickness is more reasonable.