The plan quality and delivery efficiency of intensity modulated radiotherapy on a new designed linac for left side breast cancer
10.3760/cma.j.issn.0254-5098.2019.08.010
- VernacularTitle:一种新型加速器的乳腺癌固定野调强放射治疗中计划质量和执行效率评价
- Author:
Chengqiang LI
1
;
Cheng TAO
;
Jinhu CHEN
;
Jian ZHU
;
Jie LU
;
Tong BAI
;
Guifang ZHANG
;
Tonghai LIU
;
Yong YIN
Author Information
1. 山东大学附属山东省肿瘤医院放射治疗物理科
- Keywords:
Breast cancer;
Dual layer MLC;
Intensity modulated radiotherapy;
Flatten filter free;
Segment area
- From:
Chinese Journal of Radiological Medicine and Protection
2019;39(8):614-618
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the dosimetric and delivery efficiency differences between IMRT plans based on Halcyon and Trilogy Accelerator for left side breast cancer.Methods A total of 10 patients with left side breast cancer based on the Trilogy platform were retrospectively analyzed.For each patient,plan based on Halcyon was redesigned using Eclipse Version 15.1 TPS.In order to evaluate plan quality,dose coverage of target and dose to organs at risk,monitor unit efficiency,segment size and delivery time were compared.Results Halcyon treatment platform could meet the clinical objective.Dose distribution of the target volume had no significant difference with the Trilogy plans (P＞0.05).Volumes receiving 10 Gy,20 Gy and D of the left lung were significantly reduced(Z=-2.22--1.78,P＜0.05).V5 of heart for Halcyon and Trilogy was(27.80±7.66)％ and (23.18±8.19)％,respectively(Z=-0.71,P＜0.05),while D was (7.03± 1.8)Gy and(7.11±2.40)Gy,respectively(P＞0.05).Halcyon increased the monitor unit from 1 526.2±227.7 by Trilogy to 1 770.5±383.9(Z=-0.71,P＜0.05),but decreased the delivery time from (12.38± 1.49) min by Trilogy to (3.01 ±0.28) min (Z =-3.42,P＜ 0.05).Conclusion Halcyon treatment platform can meet the clinical requirements,reduce dose to normal tissue with high delivery efficiency.
