摘要
目的:医学诊断X射线的能量是连续分布的,在开展诊断X射线质量控制中应当采用正确的能量表达方式。方法:在分析X射线产生机制的基础上以管电压为80kV、100kV、120kV的钨靶和30kV的钼靶为例,给出其能量分布形态,同时给出半值层、等效能量、平均能量等3种能量表达方式。结果:用半值层法表达诊断X射线时,应指明第一半值层、第二半值层、同质系数以及附加说明峰值管电压、过滤材料和厚度。结论:诊断X射线的能量的连续性带来表达和理解线束能量的复杂性,在实际工作中应根据需要和能力做出选择。
Objective: To reveal the characteristics of continuous energy of the diagnostic X-rays and its energetic expressions. Methods: The energetic distribution and expressions of three forms of HVL effective energy and mean energy were shown for the examples of 80 100 120kV of X-ray-tube voltages for the tungsten target and 30kV molybdenum target on the base of the mechanism of X-rays. Results: It is necessary to indicate the HVL ratio of HVL1/HVL2 tube- voltage and filtration were given to express the diagnostic energy. Conclusion: The complicity and continues of energetic distribution of the diagnostic X-rays were considered for the choice of energetic expression in the practical applications.
出处
《中国医学装备》
2013年第2期8-12,共5页
China Medical Equipment
基金
卫生行业科研专项(201002009)"辐射危害控制与核辐射卫生应急处置关键技术研究及其应用"
关键词
半值层
等效能量
平均能量
轫致辐射
标识X射线
Half value layer
Effective photon energy
Mean photon energy
Bremsstrahlung radiation, Characteristic X-Ray