用CT图像定量分析岩石受力损伤破坏过程的难点，是难以知道岩石内部的绝对密度变化量。

It is difficult to detect the absolute density of rock by ct image in quantitative analysis of rock damage process in compression.

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结论：ORG患者存在足细胞损伤，并表现出足细胞相对密度下降和绝对数目减少两种类型。

Conclusion:A relative decrease of the density and an absolute decrease in the number of podocytes was observed in ORG patients, and varied at different stage of the disease.

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CT法测得的平均密度与煤油法测定值相比，平均绝对误差不到1 . 2 %。

Comparing mean density measured by CT with kerosene mass method, mean error is less 1.2%.

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