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Flow‐metabolism coupling in human visual, motor, and supplementary motor areas assessed by magnetic resonance imaging
Author(s) -
Chiarelli Peter A.,
Bulte Daniel P.,
Gallichan Daniel,
Piechnik Stefan K.,
Wise Richard,
Jezzard Peter
Publication year - 2007
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.21171
Subject(s) - supplementary motor area , sma* , magnetic resonance imaging , functional magnetic resonance imaging , hypercapnia , cerebral blood flow , neurovascular bundle , visual cortex , motor cortex , primary motor cortex , chemistry , nuclear magnetic resonance , physics , cardiology , biomedical engineering , medicine , neuroscience , anatomy , psychology , mathematics , respiratory system , radiology , combinatorics , stimulation
Abstract Combined blood oxygenation level‐dependent (BOLD) and arterial spin labeling (ASL) functional MRI (fMRI) was performed for simultaneous investigation of neurovascular coupling in the primary visual cortex (PVC), primary motor cortex (PMC), and supplementary motor area (SMA). The hypercapnia‐calibrated method was employed to estimate the fractional change in cerebral metabolic rate of oxygen consumption (CMR O2 ) using both a group‐average and a per‐subject calibration. The group‐averaged calibration showed significantly different CMR O2 −CBF coupling ratios in the three regions (PVC: 0.34 ± 0.03; PMC: 0.24 ± 0.03; and SMA: 0.40 ± 0.02). Part of this difference emerges from the calculated values of the hypercapnic calibration constant M in each region ( M PVC = 6.6 ± 3.4, M PMC = 4.3 ± 3.5, and M SMA = 7.2 ± 4.1), while a relatively minor part comes from the spread and shape of the sensorimotor BOLD–CBF responses. The averages of the per‐subject calibrated CMR O2 −CBF slopes were 0.40 ± 0.04 (PVC), 0.31 ± 0.03 (PMC), and 0.44 ± 0.03 (SMA). These results are 10–30% higher than group‐calibrated values, and are potentially more useful for quantifying individual differences in focal functional responses. The group‐average calibrated motor coupling value is increased to 0.28 ± 0.03 when stimulus‐correlated increases in end‐tidal CO 2 are included. Our results support the existence of regional differences in neurovascular coupling, and argue for the importance of achieving optimal accuracy in hypercapnia calibrations to resolve method‐dependent variations in published results. Magn Reson Med 57:538–547, 2007. © 2007 Wiley‐Liss, Inc.