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本文提出了一种线扩散函数，用以从理论上估算Ｘ线管的ＭＴＦ。结果表明较脉冲函数更加实际，而且在空间频率较大的区域也较准确。
This paper presents a linear diffusion function to estimate the MTF of a X-ray tube theoretically. The results show that the pulse function is more practical and more accurate in the area with larger spatial frequency.