Ultrasound Techniques for Hepatic Steatosis Assessment
Summary
Ultrasound has evolved from a purely qualitative tool for detecting hepatic steatosis into a suite of quantitative modalities capable of noninvasively grading and monitoring liver fat content. Conventional B-mode imaging offers rapid real-time visualisation of liver echogenicity, but suffers from operator dependence and limited sensitivity for mild steatosis. Quantitative approaches such as attenuation imaging—measuring the rate at which ultrasound amplitude decreases with depth—provide an objective attenuation coefficient that correlates with fat fraction. Controlled attenuation parameter (CAP), implemented on transient elastography platforms, similarly quantifies attenuation but without direct B-mode guidance. More recent innovations include ultrasound-derived fat fraction (UDFF), which combines backscatter and attenuation metrics to yield a percentage estimate of hepatic fat, and adaptive sound-speed estimation, which exploits the slower propagation of ultrasound in fat versus lean tissue. Multiparametric systems now integrate shear-wave elastography, attenuation mapping and sound-speed measurements in a single examination, offering simultaneous assessment of steatosis, fibrosis and inflammation. These advances capitalise on the universal availability, safety and cost-effectiveness of ultrasound to furnish quantitative biomarkers that closely mirror magnetic resonance reference standards, opening new avenues for widespread screening, longitudinal monitoring and stratified management of fatty liver disease around the globe.
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Ultrasound Techniques for Hepatic Steatosis Assessment publication trend
The graph below shows the total number of articles in ultrasound techniques for hepatic steatosis assessment across all publications each year (not limited to Nature Index journals).
Technical terms
B-mode ultrasound: Conventional two-dimensional grey-scale imaging displaying the echogenicity of liver tissue.
Attenuation coefficient: Quantitative measure of ultrasound amplitude loss per unit depth, indicative of tissue fat content.
Controlled Attenuation Parameter (CAP): An attenuation metric derived from transient elastography probes to estimate hepatic steatosis.
Ultrasound-Derived Fat Fraction (UDFF): A composite parameter combining backscatter and attenuation data to quantify liver fat percentage.
Shear-wave elastography: Technique that generates and measures shear-wave speed to assess tissue stiffness, often used for fibrosis evaluation.
Sound-speed estimation: Measurement of the velocity of ultrasound propagation in tissue, which decreases with increasing fat content.
References
- Quantitative ultrasound approaches for diagnosis and monitoring hepatic steatosis in nonalcoholic fatty liver disease. Theranostics (2020).
- iATT liver fat quantification for steatosis grading by referring to MRI proton density fat fraction: a multicenter study. Journal of Gastroenterology (2024).
- Noninvasive Quantification of Hepatic Steatosis Using Ultrasound‐Derived Fat Fraction (CHESS2303): A Prospective Multicenter Study. MedComm (2025).
- Ultrasonic fat fraction quantification using in vivo adaptive sound speed estimation. Physics in Medicine and Biology (2018).
- Quantification of Liver Fibrosis, Steatosis, and Viscosity Using Multiparametric Ultrasound in Patients with Non-Alcoholic Liver Disease: A “Real-Life” Cohort Study. Diagnostics (2021).
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