Currently, the diagnosis of fatty liver can be determined from CT values in addition to liver biopsy. In CT scan results, CT values for mild fatty liver range from 39-60Hu, for moderate fatty liver from 4-46Hu and for severe fatty liver from 6-19Hu. The relatively large fluctuation range of this value indicates that there is a large individual variation in the CT values of the liver in normal people. However, the CT value of the liver is always higher than that of the spleen, which is relatively constant and at the same tomographic level as the liver, so the more reliable liver to spleen CT ratio is currently used to determine the degree of fatty liver. This ratio is highly correlated with the pathology of the liver and the accuracy rate can reach 98%. The CT ratio of liver and spleen should be greater than 1 in normal people, between 0.7 and 1 in mild fatty liver, between 0.5 and 0.7 in moderate fatty liver, and less than 0.5 in severe fatty liver.