Abstract #1335
Separation of VLF fluctuations from periodic cardiorespiratory noise with critically sampled magnetic resonance encephalography.
Vesa Kiviniemi 1 , Xindi Wang 2 , Vesa Korhonen 1 , Tuija Keinnen 3 , Yu-Feng Zang 4 , Pierre LeVan 5 , and Shella Keilholz 6
1
Diagnostic Radiology, MRC, Oulu University
Hospital, Oulu, Oulu, Finland,
2
Beijing
Normal University, Beijing, China,
3
Clinical
Neurophysiology, MRC, Oulu University Hospital, Oulu,
Oulu, Finland,
4
Hangzhou
Normal University, Hangzhou, China,
5
University
of Freiburg, Freiburg, Germany,
6
Emory
University, Atlanta, Georgia, United States
We imaged whole brain with magnetic resonance
encpehalography using a 100 ms TR under-sampled k-space
trajectory. This critical sampling enabled separation of
cardiac pulse and respiratory effects from very low
frequency BOLD signal sources. We show that
physiological noise has a unique spatiotemporal patterns
of noise propagation pattern throughout the brain. The
results suggest that conventional averaged external
estimates of physiological noise need to be replaced by
critically sampled brain data.
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