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Liver Fat Quantification by Ultrasound in Children: A Prospective Study
Aurélie D'Hondt1, Erika Rubesova1, Hua Xie2
1Department of Radiology, Lucile Packard Children's Hospital, Stanford University, 725 Welch Rd, Palo Alto, CA 94304.
Quantitative ultrasound parameters, including attenuation coefficient and hepatorenal index (HRI), show promise for diagnosing and quantifying pediatric nonalcoholic fatty liver disease (NAFLD). These noninvasive methods accurately detected liver fat, offering potential for improved NAFLD management in children.
Area of Science:
- Pediatric gastroenterology and hepatology
- Medical imaging and diagnostics
- Obesity-related diseases
Background:
- Nonalcoholic fatty liver disease (NAFLD) is increasingly prevalent in children, driven by rising obesity rates.
- Accurate, noninvasive methods are crucial for diagnosing and quantifying liver fat to guide NAFLD management.
- Current diagnostic methods often require invasive procedures or lack precision.
Purpose of the Study:
- To evaluate the efficacy of four ultrasound technologies for quantitative assessment of liver fat in children.
- To compare ultrasound-derived parameters with MRI proton density fat fraction (PDFF) as the reference standard.
- To determine the diagnostic accuracy of specific ultrasound parameters for detecting and quantifying pediatric NAFLD.
Main Methods:
- Prospective study involving children undergoing abdominal MRI and investigational liver ultrasound.
- Ultrasound radiofrequency data were analyzed offline to compute acoustic attenuation coefficient, hepatorenal index (HRI), Nakagami parameter, and shear-wave elastography (SWE) parameters.
- Ultrasound parameters were correlated with MRI PDFF; interobserver agreement was assessed for attenuation coefficient and HRI.
Main Results:
- PDFF correlated significantly with attenuation coefficient (r=0.76) and HRI (r=0.84), but not SWE parameters.
- Specific thresholds for attenuation coefficient and HRI demonstrated high sensitivity and specificity for detecting and grading steatosis.
- Interobserver concordance was high for both attenuation coefficient (0.92) and HRI (0.91).
Conclusions:
- Acoustic attenuation coefficient and HRI are accurate ultrasound-based methods for detecting and quantifying liver fat in children.
- These quantitative ultrasound parameters hold potential for guiding the diagnosis and management of pediatric NAFLD.
- Noninvasive ultrasound techniques offer a promising alternative for assessing liver fat in pediatric populations.
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