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Magn Reson Imaging. 2010 Jul;28(6):767-76. doi: 10.1016/j.mri.2010.03.017. Epub 2010 Apr 21.

Assessment of liver fat quantification in the presence of iron.

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  • 1University of California San Diego, San Diego, CA 92103-8226, USA. mbydder@ucsd.edu

Abstract

This study assesses the stability of magnetic resonance liver fat measurements against changes in T2* due to the presence of iron, which is a confound for accurate quantification. The liver T2* was experimentally shortened by intravenous infusion of a super paramagnetic iron oxide contrast agent. Low flip angle multiecho gradient echo sequences were performed before, during and after infusion. The liver fat fraction (FF) was calculated in co-localized regions-of-interest using T2* models that assumed no decay, monoexponential decay and biexponential decay. Results show that, when T2* was neglected, there was a strong underestimation of FF and with monoexponential decay there was a weak overestimation of FF. Curve-fitting using the biexponential decay was found to be problematic. The overestimation of FF may be due to remaining deficiencies in the model, although is unlikely to be important for clinical diagnosis of steatosis.

PMID:
20409663
PMCID:
PMC2924146
DOI:
10.1016/j.mri.2010.03.017
[PubMed - indexed for MEDLINE]
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