X光面光源的尺寸对系统线扩展函数的影响
nfluence of X-ray areasource on LSF in radiograghy system
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摘要: 在辐射照相系统中,X光源的尺寸是一个影响图像清晰度的重要参数。尤其是在使用高能的X光进行辐射照相时,特殊的照相条件使X光源面积对于系统空间分辨率的影响更为突出。针对这一现象,基于台阶照相法测量系统线扩展函数的理论建立了计算模型,模拟了面光源尺寸对于系统空间分辨率的影响,并说明了提高分辨率应采取的措施。Abstract: The size of X-ray source is always an important parameter which influences the imaging definition.In high energy X-ray radiography system,the especial conditions will prick up this affection.The calculating model is set up based on the theory of stage imaging theory,and the influence on the system's spatial resolution is simulated in this paper.The methods of reducing the influence are also introduced.
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Key words:
- areasource /
- lsf /
- imagingdimensions /
- spatial resolution
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