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Fat fraction bias correction using T1 estimates and flip angle mapping.

Issac Y Yang1, Yifan Cui, Curtis N Wiens

  • 1Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.

Journal of Magnetic Resonance Imaging : JMRI
|April 6, 2013
PubMed
Summary

This study introduces a new method to reduce T1 bias in proton density fat fraction (PDFF) measurements using iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL). High flip angle acquisitions with T1 bias correction offer superior precision and accuracy compared to low flip angle methods.

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Area of Science:

  • Magnetic Resonance Imaging (MRI) techniques
  • Quantitative MRI
  • Biomedical Engineering

Background:

  • Proton density fat fraction (PDFF) is crucial for assessing fat content in tissues.
  • T1 bias can affect the accuracy of PDFF measurements, particularly with certain MRI acquisition parameters.
  • Iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) is a common method for fat quantification.

Purpose of the Study:

  • To develop and validate a novel method for mitigating T1 bias in IDEAL-based PDFF measurements.
  • To improve the accuracy and precision of fat fraction quantification in MRI.

Main Methods:

  • Simulated and acquired PDFF maps using high flip angle IDEAL sequences from phantoms and L4 vertebrae.
  • Applied T1 bias correction using a priori T1 values for water and fat, with and without flip angle correction.
Keywords:
T1 bias correctionfat quantificationflip angle map

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  • Assessed precision using signal-to-noise ratio (SNR) maps and compared high flip angle measurements with low flip angle measurements for accuracy and precision.

    • Main Results:

    • Simulations demonstrated comparable PDFF error between low flip angle and corrected high flip angle measurements when T1 estimates were accurate.
    • Phantom and in vivo experiments showed enhanced precision and accuracy with high flip angle acquisitions and T1 bias correction.
    • Flip angle mapping in conjunction with T1 estimates improved PDFF measurement accuracy.

    Conclusions:

    • T1 bias correction using estimated T1 values and flip angle mapping in high flip angle IDEAL acquisitions provides accurate and precise PDFF measurements.
    • This method offers superior precision compared to traditional low flip angle acquisitions for fat fraction quantification.