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Hetterich, Holger; Bayerl, Christian; Peters, Annette; Heier, Margit; Linkohr, Birgit; Meisinger, Christa; Auweter, Sigrid; Kannengießer, Stephan A. R.; Kramer, Harald; Ertl-Wagner, Birgit; Bamberg, Fabian (2016): Feasibility of a three-step magnetic resonance imaging approach for the assessment of hepatic steatosis in an asymptomatic study population. In: European Radiology, Vol. 26, Nr. 6: S. 1895-1904
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Abstract

To determine the feasibility of a multi-step magnetic resonance imaging (MRI) approach for comprehensive assessment of hepatic steatosis defined as liver fat content of a parts per thousand yen5 % in an asymptomatic population. The study was approved by the institutional review board and written informed consent of all participants was obtained. Participants of a population-based study cohort underwent a three-step 3-T MRI-based assessment of liver fat. A dual-echo Dixon sequence was performed to identify subjects with hepatic steatosis, followed by a multi-echo Dixon sequence with proton density fat fraction estimation. Finally, single-voxel T2-corrected multi-echo spectroscopy was performed. A total of 215 participants completed the MRI protocol (56.3 % male, average age 57.2 +/- 9.4 years). The prevalence of hepatic steatosis was 55 %. Mean liver proton density fat fraction was 9.2 +/- 8.5 % by multi-echo Dixon and 9.3 +/- 8.6 % by multi-echo spectroscopy (p = 0.51). Dual-echo Dixon overestimated liver fat fraction by 1.4 +/- 2.0 % (p < 0.0001). All measurements showed excellent correlations (r a parts per thousand yenaEuro parts per thousand 0.9, p < 0.001). Dual-echo Dixon was highly sensitive for the detection of hepatic steatosis (sensitivity 0.97, NPV 0.96) with good specificity and PPV (0.75 and 0.81, respectively). A multi-step MRI approach may enable rapid and accurate identification of subjects with hepatic steatosis in an asymptomatic population. aEuro cent Dual-echo Dixon can rapidly and reliably exclude hepatic steatosis without complex post-processing. aEuro cent Multi-echo Dixon and multi-echo spectroscopy yield similar results regarding hepatic fat quantification. aEuro cent Each sequence can be performed in one breath-hold. aEuro cent These sequences can be implemented in routine abdominal MRI protocols. aEuro cent Thus hepatic fat can be evaluated without relevant increase in scan time.