Dosimetric Comparison of Three Radiotherapy Techniques in Prophylactic Irradiation for
Lymph Nodes of Esophageal Cancer
HAN Dongliang1,YI Fengtao1,GE Qiang1,GE Ning2
1. Department of Oncology, General Hospital of Central Theater Command of PLA, Wuhan Hubei 430070, China丨
2. Department of Radiology, Maternity and Child Healthcare Hospital of Hubei Province, Wuhan Hubei 430070, China
Abstract:Objective To explore the radiotherapy methods suitable for the prophylactic irradiation for lymph nodes of esophageal
cancer by comparing dosimetric differences of intensity modulated radiation therapy (IMRT), coplanar and non-coplanar volumetric
modulated arc therapy (VMAT). Methods Twenty patients with esophagus cancer who could not be operated at an advanced stage
and planned to receive wide range of prophylactic lymphatic irradiation were selected to formulate 7-field IMRT plan, coplanar
and non-coplanar VMAT plans respectively. The differences of dosimetric indexes of the three plans were compared, including
conformity index (CI) and homogeneity index (HI) of target areas. Several indexes of organs-at-risk, including the Dmean, V5, V10, V20,
V30 of lungs, the V30 and V40 of heart, the Dmax of spine cord were also compared. Meanwhile, treatment time and monitor units (MU)
of three techniques were recorded for comparing the implementation efficiency. Results The HI and the V20 of lungs in coplanar
and non-coplanar VMAT plans were superior to those in IMRT plan丨 the V5 of lungs in non-coplanar VMAT and IMRT plans were
superior to those in coplanar VMAT plan丨 the Dmean and V10 of lungs in non-coplanar VMAT plans were superior to those in other
plans. Compared to VMAT plans, the IMRT plans required the longest treatment time and highest MU. Conclusion Non-coplanar
VMAT can improve the dose distribution and significantly shorten the treatment time compared with IMRT. It is recommended in
prophylactic irradiation for lymph nodes of esophageal cancer.
韩栋梁1,易峰涛1,葛强1,葛宁2. 三种放疗技术在食管癌淋巴结预防性照射的剂量学比较[J]. 中国医疗设备, 2021, 36(12): 58-61.
HAN Dongliang1,YI Fengtao1,GE Qiang1,GE Ning2. Dosimetric Comparison of Three Radiotherapy Techniques in Prophylactic Irradiation for
Lymph Nodes of Esophageal Cancer. China Medical Devices, 2021, 36(12): 58-61.