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Updated: Apr 21, 2026

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Hepatic Steatosis Decreases Diffusion Parameters in Diffusion-Weighted Imaging With Monte Carlo Simulation and

Mengyan Wang1, Tingmiao Wu2, Jia Liu2

  • 1School of Biomedical Engineering, Anhui Medical University, Hefei, China.

Magnetic Resonance in Medicine
|April 20, 2026
PubMed
Summary

Hepatic steatosis, or fatty liver, negatively impacts diffusion parameters like ADC and D. Calibration is essential for accurate diffusion-weighted imaging assessment of liver fibrosis.

Keywords:
Monte Carlo simulationsdiffusion parametersdiffusion‐weighted imaginghepatic steatosisphantom

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Liver Disease Research

Background:

  • Hepatic steatosis affects liver tissue properties.
  • Diffusion-weighted imaging (DWI) parameters like ADC and D are sensitive to tissue microstructural changes.
  • Accurate calibration of DWI parameters is crucial for reliable liver disease assessment.

Purpose of the Study:

  • To calibrate the impact of hepatic steatosis on apparent diffusion coefficient (ADC) and pure diffusion coefficient (D).
  • To utilize Monte Carlo simulations and phantom studies for precise calibration.

Main Methods:

  • Constructed virtual liver models with varying fat droplet characteristics.
  • Simulated magnetic fields and proton dynamics to predict DWI signals and diffusion parameters.
  • Conducted phantom studies to correlate proton density fat fraction (PDFF) with diffusion parameters.

Main Results:

  • Simulation and phantom studies revealed a linear negative correlation between fat fraction (FF) and both ADC and D (r ≤ -0.895).
  • Simulations accurately predicted diffusion parameters when incorporating specific fat susceptibility and proton diffusivity values.
  • Hepatic steatosis was confirmed to decrease diffusion parameters.

Conclusions:

  • Hepatic steatosis significantly decreases ADC and D values.
  • Calibration of diffusion parameters is necessary for accurate DWI-based assessment of liver fibrosis in the presence of steatosis.