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✦   LIBER   ✦

The nature of spatiotemporal changes in cerebral hemodynamics as manifested in functional magnetic resonance imaging

✍ Scribed by Partha P. Mitra; Seiji Ogawa; Xiaoping Hu; Kǎmil Uǧurbil

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
1021 KB
Volume
37
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

The nature of changes in rapidly acquired magnetic resonance images of the brain was studied by using a denoising method and spectral techniques optimally suited to short time series. It was found that the stimulus related changes have a complex spatiotemporal structure even for simple visual stimuli. Apart from a low frequency window, the non‐stimulusrelated changes were found to correspond in detail to either breathing or heartbeat, although these two sources show different patterns of spatial coherence in the image. At low frequencies, oscillations with frequencies around 0.1 Hz were observed, also with nontrivial space‐time structure, which are likely to be vasomotor in origin.

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