Usage of the T1 effect of an iron oxide contrast agent in an animal model to quantify myocardial blood flow by MRI

被引:3
作者
Luedemann, Lutz
Schmitt, Boris
Podrabsky, Petr
Schnackenburg, Bernhard
Boeck, Johannes
Gutberlet, Matthias
机构
[1] Univ Med Berlin, Dept Radiol & Nucl Med, Strahlenklin, Charite, D-13353 Berlin, Germany
[2] Deutsch Herzzentrum Berlin, Dept Congenital Heart Dis, Berlin, Germany
[3] Philips Med Syst, Hamburg, Germany
关键词
magnetic resonance imaging; perfusion; blood flow; blood volume; contrast media;
D O I
10.1016/j.ejrad.2006.12.002
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
Background: To present a new method for fully quantitative analysis of myocardial blood flow (MBF) using magnetic resonance imaging. The first pass of an intravascular iron oxide contrast medium can be used to quantify myocardial perfusion. The technique was validated in an animal model using colored microspheres. Materials and methods: In six pigs, a tracking catheter was positioned in the left anterior descending artery (LAD). Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) was performed on a 1.5-T scanner using a hybrid gradient-echo/echoplanar imaging (GRE-EPI) sequence. Regional myocardial blood flow (rMBF) was altered by either inducing vasodilatation with adenosine or creating coronary artery obstruction. The T-1 effect of a superparamagnetic iron oxide-based contrast medium (Resovist((R))) administered at a dose of 8 I.Lmol/kg was used. Upslope, time-to-peak and peak intensity were calculated from the signal intensity-time curves and absolute rMBF using the Kety-Schmidt equation; results were compared to those obtained using colored microspheres. Results: The mean rMBF calculated by MRI was 1.49 (+/- 6.91, quartile width) ml/min/g versus 3.21 (+/- 1.61) ml/min/g measured by means of microspheres under resting conditions. rMBF increased to a mean of 6.21 (+/- 2.83) ml/min/g versus 4.22 (+/- 1.70) ml/min/g under adenosine and was reduced to zero flow in total occlusion. Linear regression showed the best correlation for upslope (R = 0.714), time-to-peak (R = 0.626) and the Kety-Schmidt equation (R = 0.584). Conclusions: The T-1 effect of an iron oxide-based contrast medium allows determination of rMBF when using the Kety-Schmidt equation. The results are similar to those obtained with the standard of reference, colored micropheres, but not better than the results of the serniquantitative approach. (c) 2006 Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码:247 / 256
页数:10
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