Quantification of Hepatic Steatosis With Different Ultrasound Frequency

Investigators measure the distance between the skin and liver capsule on B-mod images. Investigators place a region of interest (ROI) avoiding reverberation artifacts and acquire attenuation coefficient for five times. For participants who require a liver biopsy, investigators try to target the same area in the liver, where ROI was placed. Investigators evaluate hepatic steatosis, lobular inflammation, and fibrosis of tissue of the liver using a scoring system suggested by Nonalcoholic Steatohepatitis Clinical Research Network.