A：

We have developed a preliminary standard of fatty liver. It includes three boundary values, i.e 240, 265 and 295. A liver is regarded as normal if the value is below 240; slight fatty liver is recognized if the value is between 240 and 265; moderate level of fatty liver is recognized if the value is between 265 and 295; and level of fatty liver is considered serious if the value is above 295. The standard is a preliminary version and obtained by comparison to Doppler ultrasound. Now we are engaged in the comparison to clinical benchmark--liver biopsy.