Myocardial and hepatic iron overload assessment by region-based and pixel-wise T2∗ mapping analysis: Technical pitfalls and clinical warnings

Alberto Roghi, Erika Poggiali, Patrizia Pedrotti, Angela Milazzo, Giuseppina Quattrocchi, Elena Cassinerio, Maria Domenica Cappellini

Research output: Contribution to journalArticle

Abstract

Objective: The aim of this study was to compare myocardial T2∗ assessment with region-based (RB) T2∗ multiecho technique (CMRtools) with the pixel-wise (PW) inline myocardial T2∗ mapping (Siemens) in patients with thalassemia major for myocardial iron characterization. MATERIALS AND METHODS: Forty-three thalassemia major patients were examined on a 1.5-T scanner using conventional gradient multiecho sequence. All the images were analyzed using both RB and PW T2∗ mapping. Coefficients of reproducibility (CRs) were used to assess the interoperator and intraobserver variability of each software. RESULTS: The mean (SD) myocardial T2∗ values using RB and PW software resulted significantly different (30.7 [15] milliseconds [range, 4.8-52.6 milliseconds] vs 24.3 [10.5] milliseconds [range 4.6-38.2 milliseconds]; P <0.0001). Interestingly, we found that SD had exponential relationship with T2∗ with evidence of increase in SD for T2∗ values greater than 20 milliseconds. For myocardial T2∗ values less than 20 milliseconds, intraobserver CR was 1.2 milliseconds for RB and 1.8 milliseconds for PW T2∗ mapping, and the interoperator CR was 3.4 and 1.6 milliseconds for RB and PW T2∗ mapping, respectively. Comparing iron overload classification by both software, we found that 7 patients (16%) were differently categorized using the standard T2∗ thresholds. CONCLUSIONS: Our data show that RB and PW T2∗ mapping can be used interchangeably to measure severe myocardial and hepatic iron overload, whereas for borderline T2∗ values, we observed differences among the 2 methods causing different categorization.

Original languageEnglish
Pages (from-to)128-133
Number of pages6
JournalJournal of Computer Assisted Tomography
Volume39
Issue number1
DOIs
Publication statusPublished - Feb 2 2015

Keywords

  • iron overload
  • MRI relaxometry
  • myocardium
  • T2∗
  • thalassemia
  • tissue iron characterization

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Medicine(all)

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