nfluence of X-ray areasource on LSF in radiograghy system

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．