Magnetic Resonance Elastography Liver Stiffness NAS Scoring
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Solution Overview
Problem
Current methods for diagnosing nonalcoholic fatty liver disease (NAFLD) and nonalcoholic steatohepatitis (NASH) rely on invasive and expensive liver biopsies, which are prone to sampling errors and subjective scoring, limiting their accuracy and feasibility for widespread use.
Innovation Solution
A system and method using magnetic resonance elastography (MRE) to non-invasively determine NAFLD activity scores (NAS) by measuring mechanical properties of the liver, eliminating the need for biopsies and providing an objective, quantitative diagnosis through a statistical model that correlates these properties with NAS features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liver biopsy is used for diagnosing NAFLD and NASH, then diagnostic accuracy is improved, but invasiveness and cost increase
Solution Approach 1:
The patent replaces the mechanical invasive procedure of liver biopsy with a non-invasive magnetic resonance elastography (MRE) imaging system. The MRE system uses magnetic fields and mechanical wave propagation to measure liver mechanical properties, eliminating the need for physical tissue sampling while maintaining diagnostic capability through quantitative mechanical property measurements that correlate with histological findings.
Solution Approach 2:
The patent introduces magnetic resonance elastography as an intermediary diagnostic tool between clinical suspicion and definitive biopsy diagnosis. The MRE system measures liver stiffness and mechanical properties that serve as intermediate biomarkers, providing sufficient diagnostic information for NAFLD and NASH characterization without requiring direct tissue examination, thus reducing invasiveness while preserving diagnostic accuracy.
2Loss of information
If liver biopsy is used for NAFLD diagnosis, then diagnostic information is obtained, but sampling errors and subjective scoring occur
Solution Approach 1:
The patent replaces subjective histological scoring with objective mechanical property measurements obtained through MRE. Instead of relying on pathologist interpretation of tissue samples, the system quantifies liver stiffness, damping ratio, and other mechanical parameters that directly reflect disease severity, eliminating inter-observer variability and subjective bias while preserving comprehensive diagnostic information.
Solution Approach 2:
The patent transforms the diagnostic approach from qualitative histological scoring to quantitative mechanical property measurement. By measuring objective parameters such as liver stiffness (in kPa), damping ratio, and frequency-dependent mechanical properties, the system provides precise, reproducible data that correlates with disease severity without the subjectivity inherent in visual histological assessment.
3Reliability
If liver biopsy is performed, then NAFLD diagnosis is achieved, but cost and complexity increase
Solution Approach 1:
The patent replaces the complex multi-step biopsy procedure with a streamlined MRE imaging process. The MRE system integrates magnetic field generation, mechanical wave excitation, signal acquisition, and automated analysis into a single non-invasive examination, eliminating the need for surgical intervention, pathology processing, and subjective interpretation while maintaining diagnostic reliability through objective mechanical property measurement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for accurate, non-invasive diagnosis of NAFLD and NASH, reducing costs and complications associated with biopsies, while offering a more reliable and objective assessment of liver health through MRE imaging.
Implementation Method 1
controlling a driver to deliver an oscillatory stress to a subject to thereby direct a shear wave toward a region of interest
Implementation Method 2
controlling the magnetic resonance imaging system to perform a magnetic resonance elastography process to acquire image data from the subject
Data Source
AI summary
The present disclosure relates to a system and method for non-invasively determining NAFLD activity scores (NAS) in patients using mechanical properties determined through magnetic resonance elastography (MRE) imaging. The non-invasively determined NAS score is then used to diagnose NFALD and NASH patients.