Dosimetric Study of Different Irradiation Techniques in Postoperative Radiotherapy for Modified Radical Mastectomy for Left Breast Cancer
NI Pan1，GUO Chang2，LUO Yizhou1
1. Department of Radiotherapy, Air Force Hospital in Eastern Theater of Chinese People’s Liberation Army, Nanjing Jiangsu 210002, China| 2. Department of Radiotherapy, Jiangsu Cancer Hospital, Nanjing Jiangsu 210018, China
Abstract：Objectives To analyze the dosimetric characteristics of different radiotherapy techniques in chest wall, internal breast and supraclavicular lymph node radiotherapy after modified radical mastectomy for left breast cancer. Methods In the Elekta Monaco treatment planning system, 10 patients with modified radical mastectomy of left breast cancer were respectively formulated with mixed ray irradiation (3DCRT+elec), intensity-modulated radiation therapy (IMRT), segmented arc rotation volume intensity modulation ( VMATpart) and continuous arc rotation volume modulation (VMATcont) four kinds of radiation treatment plans, comparative analysis of CTV, lung, heart, left coronary artery anterior branch area, right breast and thyroid dose parameters. Results For patients after modified radical mastectomy of left breast cancer irradiated with 3DCRT+elec, the target area dose is inferior but the protection of normal organs is better. For IMRT, VMATpart and VMATcont plan, the target area has good uniformity and conformity. For VMATcont plan, the volume of the high-dose area in the middle-left lung, the left anterior branch of the coronary artery, and the heart is lower than the other three irradiation methods. Conlusion In clinical practice, medical physicists can formulate a variety of planning methods to make personalized choices according to clinical needs. Generally, VMATcont has potential advantages.
倪攀1，郭昌2，骆益宙1. 左乳癌改良根治术后放疗中不同照射技术的剂量学研究[J]. 中国医疗设备, 2020, 35(11): 85-88.
NI Pan1，GUO Chang2，LUO Yizhou1. Dosimetric Study of Different Irradiation Techniques in Postoperative Radiotherapy for Modified Radical Mastectomy for Left Breast Cancer. China Medical Devices, 2020, 35(11): 85-88.
