Evaluation of MR imaging with T1 and T2* mapping for the determination of hepatic iron overload View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-05-30

AUTHORS

B. Henninger, C. Kremser, S. Rauch, R. Eder, H. Zoller, A. Finkenstedt, H. J. Michaely, M. Schocke

ABSTRACT

ObjectivesTo evaluate MRI using T1 and T2* mapping sequences in patients with suspected hepatic iron overload (HIO).MethodsTwenty-five consecutive patients with clinically suspected HIO were retrospectively studied. All underwent MRI and liver biopsy. For the quantification of liver T2* values we used a fat-saturated multi-echo gradient echo sequence with 12 echoes (TR = 200 ms, TE = 0.99 ms + n × 1.41 ms, flip angle 20°). T1 values were obtained using a fast T1 mapping sequence based on an inversion recovery snapshot FLASH sequence. Parameter maps were analysed using regions of interest.ResultsROC analysis calculated cut-off points at 10.07 ms and 15.47 ms for T2* in the determination of HIO with accuracy 88 %/88 %, sensitivity 84 %/89.5 % and specificity 100 %/83 %. MRI correctly classified 20 patients (80 %). All patients with HIO only had decreased T1 and T2* relaxation times. There was a significant difference in T1 between patients with HIO only and patients with HIO and steatohepatitis (P = 0.018).ConclusionsMRI-based T2* relaxation diagnoses HIO very accurately, even at low iron concentrations. Important additional information may be obtained by the combination of T1 and T2* mapping. It is a rapid, non-invasive, accurate and reproducible technique for validating the evidence of even low hepatic iron concentrations.Key Points• Hepatic iron overload causes fibrosis, cirrhosis and increases hepatocellular carcinoma risk.• MRI detects iron because of the field heterogeneity generated by haemosiderin.• T2* relaxation is very accurate in diagnosing hepatic iron overload.• Additional information may be obtained by T1 and T2* mapping. More... »

PAGES

2478-2486

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00330-012-2506-2

DOI

http://dx.doi.org/10.1007/s00330-012-2506-2

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1020522015

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/22645044


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