Journal
NEUROIMAGE
Volume 47, Issue 4, Pages 1381-1393Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2009.04.048
Keywords
fMRI; Physiological noise; Respiration; End-tidal CO2; End-tidal O-2; Resting state; BOLD signal; Hemodynamic latency
Funding
- NIH [P41-RR09784, F31-AG032168]
- NATIONAL CENTER FOR RESEARCH RESOURCES [P41RR009784] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON AGING [F31AG032168] Funding Source: NIH RePORTER
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A significant component of BOLD fMRI physiological noise is caused by variations in the depth and rate of respiration. It has previously been demonstrated that a breath-to-breath metric of respiratory variation (respiratory volume per time; RVT), computed from pneumatic belt measurements of chest expansion, has a strong linear relationship with resting-state BOLD signals across the brain. RVT is believed to capture breathing-induced changes in arterial CO2, Which is a cerebral vasodilator; indeed, separate studies have found that spontaneous fluctuations in end-tidal CO2 (PETCO2) are correlated with BOLD signal time series. The present study quantifies the degree to which RVT and PETCO2 measurements relate to one another and explain common aspects of the resting-state BOLD signal. It is found that RVT (particularly when convolved with a particular impulse response, the respiration response function) is highly correlated with PETCO2, and that both explain remarkably similar spatial and temporal BOLD signal variance across the brain. In addition, end-tidal O-2 is shown to be largely redundant with PETCO2. Finally, the latency at which PETCO2 and respiration belt measures are correlated with the time series of individual voxels is found to vary across the brain and may reveal properties of intrinsic vascular response delays. (C) 2009 Elsevier Inc. All rights reserved.
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