Hepatorenal echo contrast (HR-EC) is a useful ultrasonographic hallmark of fatty liver. The contrast
is best quantified by measuring the difference in echo intensity between hepatic and renal regions that are
located close to each other along a single beam. A difference of 7 dB or more clearly distinguished fatty
livers from normal livers in this study. Contrary to the conventional difference at the same depth or
intensity ratio, this parameter is not affected by either the echoic attenuation through surface structures
or shifts in the gain.