Mitra, P. P., Ogawa, S., Hu, X., Uǧurbil, K. (1997) The nature of spatiotemporal changes in cerebral hemodynamics as manifested in functional magnetic resonance imaging. Magnetic Resonance in Medicine, 37 (4). pp. 511-518. ISSN 07403194 (ISSN)
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 epatiotemporal structure even for simple visual stimuli. Apart from a low frequency window, the non-stimulus-related 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.
| Item Type: | Paper |
|---|---|
| Uncontrolled Keywords: | denoising multitaper methods singular value decomposition vasomotion article brain circulation human human experiment normal human nuclear magnetic resonance imaging oscillation stimulation vasomotor reflex Blood Vessels Brain Cerebrovascular Circulation Hemodynamic Processes Humans Image Processing Computer-Assisted Magnetic Resonance Imaging Photic Stimulation |
| Subjects: | physics > biophysics Investigative techniques and equipment > magnetic resonance imaging physics > noise physics |
| CSHL Authors: | |
| Communities: | CSHL labs > Mitra lab |
| Depositing User: | CSHL Librarian |
| Date: | 1997 |
| Date Deposited: | 02 Apr 2012 21:03 |
| Last Modified: | 10 Feb 2017 17:22 |
| Related URLs: | |
| URI: | https://repository.cshl.edu/id/eprint/25860 |
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