Assessment of liver fat quantification in the presence of iron

被引:38
作者
Bydder, Mark [1 ]
Shiehmorteza, Masoud [1 ]
Yokoo, Takeshi [1 ]
Sugay, Sebastian [2 ]
Middleton, Michael S. [1 ]
Girard, Olivier [1 ]
Schroeder, Michael E. [1 ]
Wolfson, Tanya [3 ]
Gamst, Anthony [3 ]
Sirlin, Claude [1 ]
机构
[1] Univ Calif San Diego, San Diego, CA 92103 USA
[2] Univ Hawaii, John A Burns Sch Med, Honolulu, HI 96813 USA
[3] Univ Calif San Diego, Dept Biostat, La Jolla, CA 92093 USA
关键词
Liver; Fat quantification; SPIO; Iron; PROTON SPECTROSCOPY; MR; DIXON; SUSCEPTIBILITY; SEPARATION; FRACTION; WATER; IDEAL; BONE;
D O I
10.1016/j.mri.2010.03.017
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
This study assesses the stability of magnetic resonance liver fat measurements against changes in T2* due to the presence of iron, which is a confound for accurate quantification. The liver T2* was experimentally shortened by intravenous infusion of a super paramagnetic iron oxide contrast agent. Low flip angle multiecho gradient echo sequences were performed before, during and after infusion. The liver fat fraction (FF) was calculated in co-localized regions-of-interest using T2* models that assumed no decay, monoexponential decay and biexponential decay. Results show that, when T2* was neglected, there was a strong underestimation of FF and with monoexponential decay there was a weak overestimation of FF. Curve-fitting using the biexponential decay was found to be problematic. The overestimation of FF may be due to remaining deficiencies in the model, although is unlikely to be important for clinical diagnosis of steatosis. (C) 2010 Elsevier Inc. All rights reserved.
引用
收藏
页码:767 / 776
页数:10
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