期刊
NEUROIMAGE
卷 46, 期 2, 页码 411-418出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2009.02.003
关键词
fMRI; DWI; Hippocampus; Brain slice; Kainic acid; CNQX; MK-801
资金
- National Danish Research Foundation's Center of Functionally Integrative Neuroscience (CFIN) [95093538-2458, 100297]
- National Institutes of Health [P41 RR16105, RO1 NS36992]
- National Science Foundation
- National High Magnetic Field Laboratory.
Functional magnetic resonance imaging (fMRI) has become the leading modality for studying the working brain. Being based on measuring the haemodynamic changes after enhanced mass neuronal activity the spatiotemporal resolution of the method is somewhat limited. Alternative MR-based methods for detection of brain activity have been proposed and investigated and studies have reported functional imaging based on diffusion weighted (DW) MRI. The basis for such DW fMRI is believed to be the sensitivity of diffusion weighted MRI to changes in tissue micro-structure. However, it remains unclear whether signal changes observed with these methods reflect cell swelling related to neural activation, residual vascular effects, or a combination of both. Here we present evidence of a detectable, activity-related change in the diffusion weighted MR-signal from the cellular level in live hippocampal slices in the absence of vasculature. Slices are exposed to substances which evoke or inhibit neural activity and the effects are evaluated and compared. The results are also compared to earlier DW fMRI studies in humans. (C) 2009 Elsevier Inc. All rights reserved.
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