作者
EM Haacke, A Hopkins, S Lai, P Buckley, L Friedman, H Meltzer, P Hedera, R Friedland, S Klein, L Thompson, D Detterman, J Tkach, JS Lewin
发表日期
1994/3
期刊
NMR in Biomedicine
卷号
7
期号
1‐2
页码范围
54-62
出版商
John Wiley & Sons, Ltd.
简介
Recent emphasis on high resolution gradient echo studies in functional imaging has led to the conclusion that there are likely three domains of response to the blood circulation in the brain when considering field inhomogeneity effects of the venous blood pre‐ and during activation. The first is a coherent effect due to large or macroscopic vessels on the order of the size of the voxel (ca 200–500 μm in most studies). These can lead to very large signal changes (up to 100%). The second is at the venule level (ca 50–200 μm) and is associated with smaller parenchymal changes (usually ca 10% or less). The third is at the capillary level and is associated with much smaller signal changes at 1.5T and even up to 4 T. The actual signal changes depend on field strength and sequence design. In this paper, we present our experience in detecting the first two domains with 2D and 3D gradient echo imaging at 1.5T. We find …
引用总数
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