Dosimetric study of two-arc and dual-arc techniques in VMAT program for lower mid-thoracic esophageal cancer
10.19745/j.1003-8868.2024010
- VernacularTitle:双弧与对偶弧技术在胸中下段食管癌VMAT计划中的剂量学研究
- Author:
Yong-Fu FENG
1
;
Yu-Song LONG
;
Jun-Wen TAN
;
Xian-Tao HE
;
Gang LI
;
Zhan-Yu WANG
Author Information
1. 柳州市工人医院肿瘤科,广西柳州 545005
- Keywords:
lower mid-thoracic esophageal cancer;
two arc;
dual arc;
volumetric modulated arc therapy;
dosimetric parameter
- From:
Chinese Medical Equipment Journal
2024;45(1):62-66
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare the effects of two arc(TA)and dual arc(DA)techniques on the dose distribution to the planning target volume(PTV)and organs at risk(OAR)in volumetric modulated arc therapy(VMAT)for lower mid-thoracic esophageal cancer.Methods Ten patients with lower mid-thoracic esophageal cancer who received radiation therapy at some hospital from July 2020 to June 2022 were selected retrospectively.A TA radiation therapy plan and a DA radiation therapy plan were developed for each patient using the Ray Arc module of RayStation 4.7.5.4 planning system,and the two kinds of radiation plans were compared in terms of dosimetric parameters including D2,D5,D50,D95,D98,homogeneity index(HI),conformity index(CI),beam-on time and total monitor unit for PTV and lung V5,V10,V20,V30 and Dmean and heartV30,V40 and Dmean and spine cord Dmax for OAR.SPSS 22.0 was used for statistical analysis.Results TA and DA radiation therapy plans had no significant differences in PTV CI,HI,D2,D5,D50,D95 and beam-on time(P＞0.05),and DA plan had D98 and total monitor unit higher obviously than those of TA plan(P＜0.05).In terms of OARs protection,DA plan had heart V30,V40 and Dmean slightly lower than those of TA plan with non-significantly differences(P＞0.05),while lung V5,V30 and Dmean and spine cordDmax significantly lower(P＜0.05).Conclusion DA technique gains advantages over TA technique in PTV dose distribution and dose to OAR,and the involvement of DA technique in preparing the VMAT plan for esophageal cancer contributes to enhancing the treatment efficacy.[Chinese Medical Equipment Journal,2024,45(1):62-66]
