Estudio de la perfusi贸n cerebral mediante t茅cnicas de susceptibilidad magn茅tica: t茅cnica y aplicaciones

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• 作者：J.A. Guzmá ; n-de-Villoriap>ap>p> ; p>p>bp>p> ; p>p>jguzman.hgugm@salud.madrid.orgp> ; P. Ferná ; ndez-Garcí ; ap>ap> ; J.M. Mateos-P&#233 ; rezp>bp>p> ; p>p>cp> ; M. Descop>bp>p> ; p>p>cp>p> ; p>p>dp>
• 关键词：Imagen de perfusió ; n por resonancia magné ; tica ; Tumores cerebrales ; Esclerosis mú ; ltiple ; Trombosis cerebral
• 刊名：Radiolog篓陋a
• 出版年：2012
• 期刊代码：pca298_00338338
• 类别：med
• 出版时间：May-June, 2012
• 卷：54
• 期：3
• 页码：208-220
• 文件大小：1605 K

摘要

<p>Perfusion MRI makes it possible to evaluate the cerebral microvasculature through changes in signal due to a tracer passing through blood vessels. The most commonly used technique is based on the magnetic susceptibility of gadolinium in T2*-weighted sequences, and the most commonly evaluated parameters are cerebral blood volume, cerebral blood flow, and mean transit time. Diverse technical aspects, like the sequence used, and the dose and speed of contrast material injection, must be taken into account in perfusion MRI studies. It is also essential to consider possible sources of error like contrast material leaks due to changes in the permeability of the blood-brain barrier. The most widely used clinical applications of perfusion MRI include the determination of the degree of aggressiveness of gliomas, the differentiation of some histological types of tumors or pseudotumors, and the evaluation of the penumbral area in acute ischemia.