在表面覆盖度比较高时，表面扩散系数有一极大值。
There is a maximum of the surface diffusivity in high surface coverage.
目的探讨SENSE基础上扩散加权成像在诊断肝占位性病变中的应用价值以及表面扩散系数（ADC）评估肝占位病变的价值。
Objective:To evaluate the value of diffusion-weighted imaging based on SENSE technology and apparent diffusion coefficient (ADC) in diagnosis of hepatic masses.
分析了比表面积、平均孔径、孔隙率等孔隙特性参数对扩散的影响，获得了分形多孔介质中气体扩散系数与平均孔径的函数关系。
The effect of pore characteristics on gas diffusion was analyzed. The relationships between the specific area, average pore diameter and porosity with the diffusion coefficient were obtained.
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