期刊
MAGNETIC RESONANCE IN MEDICINE
卷 51, 期 3, 页码 518-524出版社
WILEY
DOI: 10.1002/mrm.10720
关键词
brain mapping; functional MRI; neural activity; cortical layer; high fields
资金
- NCRR NIH HHS [RR08079] Funding Source: Medline
- NIBIB NIH HHS [EB00332, EB00201, EB00337] Funding Source: Medline
- NINDS NIH HHS [NS44589] Funding Source: Medline
To examine cortical depth-related spatial specificity and signal changes in gradient-echo (GE) and spin-echo (SE) blood oxygenation level-dependent (BOLD) fMRI signals, a well-established cat visual stimulation model was used at 9.4T. The GE BOLD signal percent change is the highest at the surface of the cortex containing pial vessels, and decreases as cortical depth increases. In contrast, the SE BOLD signal is more specific to parenchyma, showing the highest signal change in the middle cortical areas. The stimulation-induced DeltaR(2)* to DeltaR(2) ratio is dependent on the vessel size, which is related to basal susceptibility effects. The averaged ratio of DeltaR(2)* to DeltaR(2) in all active regions, including large vessels, is 3.3+/-0.5 (N=6). The averaged ratio of DeltaR(2)* to DeltaR(2) is 8.8+/-1.7 (N=4) on the surface of the cortex with large pial draining vessels, and decreases to 1.9+/-0.1 on the middle cortical areas with parenchymal microvessels. DeltaR(2)*/DeltaR(2) is closely related to basal susceptibility effects and can be used to differentiate tissue from vessel regions. (C) 2004 Wiley-Liss, Inc.
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