Ultrasound-based attenuation imaging for assessing steatosis severity in overweight/obese children: a prospective single-center study

OBJECTIVES: To prospectively evaluate the correlation between the attenuation imaging (ATI) parameter and hepatic steatosis in overweight (OW)/obese (OB) children, and to establish normal ATI reference values from a prospectively enrolled cohort of healthy children. MATERIALS AND METHODS: A total of 653 prospectively enrolled children were categorized into OW, OB, and normal control groups based on body mass index (BMI). Ultrasonographic hepatic steatosis grading and ATI measurements were independently assessed by two radiologists. Hepatic steatosis was graded visually as none, mild, moderate, or severe. RESULTS: The final study cohort consisted of 97 OW, 292 OB, and 264 control children. Median attenuation coefficient obtained with ATI for normal control group, OW group, and OB group were 0.51, 0.54, and 0.64 dB/cm/MHz, respectively. Statistically significant differences in ATI values were observed among all three groups (all p < 0.001). In the combined OW/OB subgroup, ATI values demonstrated a significant weak to strong positive correlation with age, height, weight, BMI, skin-to-liver distance, serum alanine aminotransferase, aspartate aminotransferase, triglycerides, and uric acid (all p < 0.05). Additionally, ATI values increased stepwise with the severity of hepatic steatosis and showed a statistically significant positive correlation with steatosis grade, with higher grades corresponding to greater ATI values (η² = 0.626, p < 0.001). CONCLUSIONS: ATI values exhibit a significant stepwise increase across healthy, OW, and OB pediatric cohorts, and correlate with anthropometric/metabolic profiles and ultrasonographic steatosis severity. This evidence positions ATI as a non-invasive tool to grade severity and monitor treatment response in metabolic-associated steatotic liver disease. CRITICAL RELEVANCE STATEMENT: ATI shows significant increases across pediatric weight groups, correlating with metabolic profiles and steatosis severity, positioning it as a non-invasive metabolic-associated steatotic liver disease assessment tool. KEY POINTS: The ATI value increased significantly in a stepwise manner from healthy controls to OW and OB children, confirming its sensitivity to fat-related liver changes. ATI correlates significantly with most metabolic and anthropometric parameters in OW and OB children, suggesting its utility in reflecting metabolic status. ATI values increase progressively with hepatic steatosis severity and show a strong positive correlation with ultrasonographic steatosis grade.