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Diffusion analysis with triexponential function in hepatic steatosis.

Tatsuya Hayashi1, Tosiaki Miyati, Junji Takahashi

  • 1Department of Radiological Technology, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo, 105-8470, Japan, ja_nei3@yahoo.co.jp.

Radiological Physics and Technology
|October 5, 2013
PubMed
Summary

Hepatic steatosis significantly reduces perfusion-related diffusion (Dp) and fast free diffusion (Df) in the liver. These diffusion parameters correlate with hepatic fat fraction, impacting triexponential analysis for liver disease assessment.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Hepatology

Background:

  • Liver steatosis, characterized by fat accumulation in hepatocytes, is a common condition.
  • Diffusion-weighted magnetic resonance imaging (DW-MRI) is a valuable tool for assessing liver tissue characteristics.
  • Triexponential analysis models diffusion in the liver using perfusion-related (Dp), fast free (Df), and slow restricted (Ds) diffusion components.

Purpose of the Study:

  • To evaluate the impact of liver steatosis on diffusion parameters derived from triexponential analysis.
  • To determine the correlation between hepatic fat fraction (HFF) and diffusion coefficients (Dp, Df, Ds).

Main Methods:

  • Thirty-three patients underwent DW-MRI with multiple b values for triexponential analysis.
  • Hepatic fat fraction (HFF) was measured using dual-echo gradient-echo imaging.
  • Patients were categorized into control (HFF ≤5%) and fatty liver (HFF >5%) groups.
  • Statistical analysis included Mann-Whitney U test and Pearson correlation.

Main Results:

  • Perfusion-related diffusion (Dp) and fast free diffusion (Df) were significantly reduced in patients with hepatic steatosis compared to controls.
  • Dp and Df showed significant negative correlations with HFF (r = -0.64 and r = -0.56, respectively).
  • No significant differences were observed in slow restricted diffusion (Ds) or diffusion fractions between groups.

Conclusions:

  • Hepatic steatosis influences Dp and Df, likely due to decreased liver perfusion and altered fat accumulation.
  • The findings highlight the importance of considering hepatic steatosis when interpreting diffusion parameters from triexponential analysis in diffuse liver disease.