CAJ | 학술논문

目的通过比较不同电离室测量及蒙特卡罗计算结果,研究不同方法对小野数据测量的适用性.方法用不同电离室测量及蒙特卡罗计算瓦里安6MVX线在0.5 cmx0.5 cm ～10 cm×10 cm射野的总散射因子和百分深度剂量,对测量和计算结果进行比较和分析.结果当射野≥3.5 cm×3.5 cm时各电离室测量及蒙特卡罗计算结果间差异较小,当射野≤3.0 cmx3.0cm时不同结果间差异明显.CC04、CC13电离室适合于≥2.0 cm×2.0 cm射野的总散射因子和百分深度剂量测量.结论 CC04、CC13电离室测量和蒙特卡罗计算方法能确定≥2.0 cm×2.0cm射野的总散射因子和百分深度剂量,更小射野测量和计算数据需慎重评估.
목적 통과비교불동전리실측량급몽특잡라계산결과,연구불동방법대소야수거측량적괄용성.방법 용불동전리실측량급몽특잡라계산와리안6MVX선재0.5 cmx0.5 cm ～10 cm×10 cm사야적총산사인자화백분심도제량,대측량화계산결과진행비교화분석.결과 당사야≥3.5 cm×3.5 cm시각전리실측량급몽특잡라계산결과간차이교소,당사야≤3.0 cmx3.0cm시불동결과간차이명현.CC04、CC13전리실괄합우≥2.0 cm×2.0 cm사야적총산사인자화백분심도제량측량.결론 CC04、CC13전리실측량화몽특잡라계산방법능학정≥2.0 cm×2.0cm사야적총산사인자화백분심도제량,경소사야측량화계산수거수신중평고.
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.