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Feasibility, reproducibility, and reliability for the T * 2 iron evaluation at 3 T in comparison with 1.5 T
Author(s) -
Meloni Antonella,
Positano Vincenzo,
Keilberg Petra,
De Marchi Daniele,
Pepe Pasquale,
Zuccarelli Angelo,
Campisi Saveria,
Romeo Maria Antonietta,
Casini Tommaso,
Bitti Pier Paolo,
Gerardi Calogera,
Lai Maria Eliana,
Piraino Basilia,
Giuffrida Gaetano,
Secchi Giuseppina,
Midiri Massimo,
Lombardi Massimo,
Pepe Alessia
Publication year - 2012
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.23236
Subject(s) - reproducibility , reliability (semiconductor) , nuclear medicine , magnetic resonance imaging , cardiac magnetic resonance , medicine , cardiology , mathematics , radiology , statistics , physics , power (physics) , quantum mechanics
This study aimed to determine the feasibility, reproducibility, and reliability of the multiecho T * 2 Magnetic resonance imaging technique at 3 T for myocardial and liver iron burden quantification and the relationship between T * 2 values at 3 and 1.5 T. Thirty‐eight transfusion‐dependent patients and 20 healthy subjects were studied. Cardiac segmental and global T * 2 values were calculated after developing a correction map to compensate the artifactual T * 2 variations. The hepatic T * 2 value was determined over a region of interest. The intraoperator and interoperator reproducibility for T * 2 measurements at 3 T was good. A linear relationship was found between patients' R * 2(1000/ T * 2 ) values at 3 and 1.5 T. Segmental correction factors were significantly higher at 3 T. A conversion formula returning T * 2 values at 1.5 T from values at 3 T was proposed. A good diagnostic reliability for T * 2 assessment at 3 T was demonstrated. Lower limits of normal for 3 T T * 2 values were 23.3 ms, 21.1 ms, and 11.7 ms, for the global heart, mid‐ventricular septum, and liver, respectively. In conclusion, T * 2 quantification of iron burden in the mid‐ventricular septum, global heart, and no heavy–moderate livers resulted to be feasible, reproducible, and reliable at 3 T. Segmental heart T * 2 analysis at 3 T may be challenging due to significantly higher susceptibility artifacts. Magn Reson Med, 2012. © 2011 Wiley Periodicals, Inc.