Chemical Shift magnetization transfer magnetic resonance imaging

Weiguo Li*, Xifu Wang, Frank H. Miller, Andrew C. Larson

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Purpose: The purpose of this work was to develop a chemical shift magnetization transfer (CSMT) magnetic resonance imaging (MRI) method to provide accurate magnetization transfer ratio (MTR) measurements in the presence of fat. Methods: Numerical simulations were performed to compare MTR measurements at different echo times (TEs) for voxels with varying fat/water content. The CSMT approach was developed using water fraction estimates to correct for the impact of fat signal upon observed MTR measurements. The CSMT method was validated with oil/agarose phantom and animal studies. Results: Simulations demonstrated that the observed MTRs vary with water fraction as well as with the TE-dependent phase difference between fat and water signals; simulations also showed that a linear relationship exists between MTR and water fraction when fat and water signals are in phase. For phantom studies, observed MTR decreased with increasing oil fraction: 42.41 ± 0.54, 38.12 ± 0.33, 32.93 ± 0.56, and 26.08 ± 0.87 for 5% to 40% oil fractions, respectively, compared to 42.63 ± 1.04 for phantom containing 4% agarose only. These offsets were readily corrected with the additional acquisition of a water fraction map. Conclusion: Fat fraction and TE can significantly impact observed MTR measurements. The new CSMT approach offers the potential to eliminate the effects of fat upon MTR measurements. Magn Reson Med 78:656–663, 2017.

Original languageEnglish (US)
Pages (from-to)656-663
Number of pages8
JournalMagnetic resonance in medicine
Volume78
Issue number2
DOIs
StatePublished - Aug 2017

Keywords

  • chemical shift
  • fat
  • fat water separation
  • magnetization transfer

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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