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• W2896471030 abstract "The liver R2* value is widely used as a measure of liver iron but may be confounded by the presence of hepatic steatosis and other covariates.To identify the most influential covariates for liver R2* values in patients with nonalcoholic fatty liver disease (NAFLD).Retrospective analysis of prospectively acquired data.Baseline data from 204 subjects enrolled in NAFLD/NASH (nonalcoholic steatohepatitis) treatment trials.1.5T and 3T; chemical-shift encoded multiecho gradient echo.Correlation between liver proton density fat fraction and R2*; assessment for demographic, metabolic, laboratory, MRI-derived, and histological covariates of liver R2*.Pearson's and Spearman's correlations; univariate analysis; gradient boosting machines (GBM) multivariable machine-learning method.Hepatic proton density fat fraction (PDFF) was the most strongly correlated covariate for R2* at both 1.5T (r = 0.652, P < 0.0001) and at 3T (r = 0.586, P < 0.0001). In the GBM analysis, hepatic PDFF was the most influential covariate for hepatic R2*, with relative influences (RIs) of 61.3% at 1.5T and 47.5% at 3T; less influential covariates had RIs of up to 11.5% at 1.5T and 16.7% at 3T. Nonhepatocellular iron was weakly associated with R2* at 3T only (RI 6.7%), and hepatocellular iron was not associated with R2* at either field strength.Hepatic PDFF is the most influential covariate for R2* at both 1.5T and 3T; nonhepatocellular iron deposition is weakly associated with liver R2* at 3T only.4 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2019;49:1456-1466." @default.
• W2896471030 created "2018-10-26" @default.
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• W2896471030 date "2018-10-14" @default.
• W2896471030 modified "2023-10-16" @default.
• W2896471030 title "Hepatic R2* is more strongly associated with proton density fat fraction than histologic liver iron scores in patients with nonalcoholic fatty liver disease" @default.
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• W2896471030 doi "https://doi.org/10.1002/jmri.26312" @default.
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