Measurement and calculation of X-ray small fields' data for Varian accelerator

VernacularTitle:瓦里安加速器6 MV X线小野数据测量与计算比较
Author: Xuetao WANG ; Shaowen CHEN ; Zhenhui DAI ; Lin ZHU ; Xiaowei LIU
Publication Type:Journal Article
Keywords: Ionization chamber measurement; Monte Carlo calculation; Small field's data
From: Chinese Journal of Radiation Oncology 2012;(6):557-559
CountryChina
Language:Chinese
Abstract: Objective The beam data is compared with those obtained from Monte Carlo (MC)simulation and measurement to investigate their feasibility and reliability for X-ray small fields.MethodsThe beam data,including the total scatter factor (Scp),percentage depth dose (PDD) was acquired byneasurement and calculation with the field size ranging from 0.5 cm × 0.5 cm to 10 cm x 10 cm.The resultswere compared and analyzed.Results All the data is most consistent for the fields size of ≥3.5 cmx 3.5cm,but they are obvious different for the fields size of ≤ 3.0 cm × 3.0 cm.The measurements seem toreliable using the chambers of CC04 and CC13 for the fields size of ≥2.0 cm x 2.0 cm.Conclusions It isdemonstrated that the accurate measurements and calculations of Scp and PDD can be obtained for the fieldssize of ≥2.0 cm ×2.0 cm,but they needed morc rcscarchcs for thc smaller fields.