Radiologic evaluation of nonalcoholic fatty liver disease

Figure 2 Computed tomography evaluation of hepatic steatosis using computed tomography_L-S index. A: Computed tomography (CT) image of a normal liver, showing that its attenuation (65 HU) measured using regions-of-interest (white circles) was higher than that of the spleen (50 HU), and the CT_L-S value was 15 HU, which lies within the normal reference range; B: CT image of a steatotic liver, showing hepatic attenuation (10.5 HU) much lower than that of the spleen (51 HU), making the CT_L-S value -40.5 HU, far below the normal reference range and indicating moderate-to-severe hepatic steatosis.