摘要
Abstract
Objective By studying the effect of X-ray dosimetry of three accelerators, including Elekta Precise, Elekta Synergy, and Varian 21CX, this paper aimed to set up optimized parameters for treatment plan system.Methods On different level monitoring unit (MU), the research measured three basic parameters to describer X-ray characteristics: linearity of output dose, ifeld uniformity, and hardness. Results When 1≤MU<5, the dosage difference of each monitoring unit was less than 1.9%; when MU≥5, the dosage difference of each monitoring unit was less than 0.8%; when MU≥3, the errors of the uniformity, symmetry, and hardness were all within the allowable range.Conclusion Different types of occelerators had different parameters, the effects of low MU on accelerators varied. Thus it was necessary to measure basic characteristics of different accelerators at regular intervals.关键词
低MU/输出剂量的线性/射野平坦度/射野对称性/射线质Key words
low monitoring unit (MU)/linearity of output dose/ifeld uniformity/ifeld symmetry/actinogen分类
机械制造
