Comparison of diffusion-weighted with T2-weighted imaging for detection of edema in acute myocardial infarction

Journal of Cardiovascular Magnetic Resonance

Research

Katarzyna Katulska¹  Andrzej Siniawski²  Małgorzta Pyda²  Stefan Grajek²  Anna Kociemba²  Magdalena Janus²  Magdalena Łanocha² 

[1] Department of Radiology, University of Medical Sciences, Poznan, Poland;Magnetic Resonance Unit, I’st Department of Cardiology, University of Medical Sciences, Poznan, Poland;

关键词: Cardiovascular Magnetic Resonance;    Late Gadolinium Enhancement;    Diffusion Weight Image;    Myocardial Edema;    Late Gadolinium Enhancement Image;   

DOI  :  10.1186/1532-429X-15-90

 received in 2013-05-15, accepted in 2013-10-01,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundRecent studies, performed with the use of a commercially available diffusion weighted imaging (DWI) sequence, showed that they are sensitive to the increase of water content in the myocardium and may be used as an alternative to the standard T2-weighted sequences. The aim of this study was to compare two methods of myocardial edema imaging: DWI and T2-TIRM.MethodsThe study included 91 acute and post STEMI patients. We applied a qualitative and quantitative image analysis. The qualitative analysis consisted of evaluation of the quality of blood suppression, presence of artifacts and occurrence of high signal (edema) areas. On the basis of edema detection in AMI and control (post STEMI) group, the sensitivity and specificity of TIRM and DWI were determined. Two contrast to noise ratios (CNR) were calculated: CNR1 - the contrast between edema and healthy myocardium and CNR2 - the contrast between edema and intraventricular blood pool. The area of edema was measured for both TIRM and DWI sequences and compared with the infarct size in LGE images.ResultsEdema occurred more frequently in the DWI sequence. A major difference was observed in the inferior wall, where an edema-high signal was observed in 46% in T2-TIRM, whereas in the DWI sequence in 85%. An analysis of the image quality parameters showed that the use of DWI sequence allows complete blood signal suppression in the left ventricular cavity and reduces the occurrence of motion artifacts. However, it is connected with a higher incidence of magnetic susceptibility artifacts and image distortion. An analysis of the CNRs showed that CNR1 in T2-TIRM sequence depends on the infarct location and has the lowest value for the inferior wall. The area of edema measured on DWI images was significantly larger than in T2-TIRM.ConclusionsDWI is a new technique for edema detection in patients with acute myocardial infarction which may be recommended for the diagnosis of acute injuries, especially in patients with slow-flow artifacts in TIRM images.

【 授权许可】

CC BY   
© Kociemba et al.; licensee BioMed Central Ltd. 2013