Dosimetric verification on intensity modulated radiotherapy in Jiangsu province

VernacularTitle:江苏省调强放疗剂量学验证研究
Author: Jin WANG ¹ ; Chunyong YANG ; Yuanyuan ZHOU ; Ningle YU
Author Information

1. 210009,南京江苏省疾病预防控制中心
Keywords: Intensity modulated radiotherapy; Dose verification; Thermoluminescent dosimeter; Film
From: Chinese Journal of Radiological Medicine and Protection 2018;38(2):121-124
CountryChina
Language:Chinese
Abstract: Objective To explore the dosimetric verification method for absorbed dose and twodimensional dose distribution generated through multi-leaf collimator in radiotherapy.Methods A total of 8 medical accelerators were selected in Jiangsu province.Under 6 MV X-rays with a 5 cm × 5 cm field,the thermoluminescent dosimeter (TLD) and EBT3 radiochromic film (RCF) were used to audit the values calculated by treatment planning system (TPS).RCF was used to verify two-dimensional dose distribution under the 6 MV MLC beams for intensity modulated radiation therapy (IMRT).Results The relative dose deviation was from-1.4％ to 6.8％ for TLD and from-1.8％ to 7.8％ for RCF,with 7 accelerators meeting with the IAEA deviation requirement of ± 5％.The passing rates of two-dimensional dose distribution were between 73.7％ and 97.0％,with 7 accelerators greater than 90％.Conclusions TLD and RCF are feasible and suitable for large-scale verification of IMRT TPS absorbed dose and twodimensional dose distribution.