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Detecting Early-Stage Liver Fibrosis Using Macromolecular Proton Fraction Mapping Based on Spin-Lock MRI: Preliminary

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Macromolecular proton fraction (MPF) using spin-lock MRI shows promise for detecting early liver fibrosis. This novel technique accurately differentiates fibrosis stages without confounding factors like iron or fat concentration.

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Area of Science:

  • Biomedical Imaging
  • Magnetic Resonance Imaging
  • Hepatology

Background:

  • Liver fibrosis is characterized by macromolecule deposition.
  • Macromolecular proton fraction quantification based on spin-lock MRI (MPF-SL) is a novel technology for measuring macromolecule levels.

Purpose of the Study:

  • To evaluate the potential of MPF-SL in detecting early-stage liver fibrosis.
  • To assess if MPF-SL measurements are confounded by liver iron concentration (LIC) or fat fraction (FF).

Main Methods:

  • A retrospective study involving 55 participants (22 with no fibrosis, 33 with early fibrosis).
  • Utilized 3T MRI with 2D MPF-SL turbo spin-echo, 2D spin-lock T1rho turbo spin-echo, and multi-slice 2D gradient echo sequences.
  • Quantified macromolecular proton fraction (MPF), T1rho, LIC, and FF biomarkers.

Main Results:

  • MPF was significantly higher in participants with early fibrosis (F1-2) compared to those without (F0) (5.65% vs 4.73%).
  • MPF demonstrated a positive correlation with liver fibrosis (ρ=0.59) and showed good diagnostic performance (AUC=0.85).
  • T1rho did not show significant differences or correlations with fibrosis, LIC, or FF.

Conclusions:

  • MPF-SL is a promising technique for diagnosing early-stage liver fibrosis.
  • MPF-SL measurements are not significantly confounded by LIC or FF, suggesting its specificity for fibrosis detection.