Abstract
Abstract A biomechanical model is presented for the dynamic changes in deoxyhemoglobin content during brain activation. The model incorporates the conflicting effects of dynamic changes in both blood oxygenation and blood volume. Calculations based on the model show pronounced transients in the deoxyhemoglobin content and the blood oxygenation level dependent (BOLD) signal measured with functional MRI, including initial dips and overshoots and a prolonged post‐stimulus undershoot of the BOLD signal. Furthermore, these transient effects can occur in the presence of tight coupling of cerebral blood flow and oxygen metabolism throughout the activation period. An initial test of the model against experimental measurements of flow and BOLD changes during a finger‐tapping task showed good agreement.
Keywords
OxygenationBlood flowBlood oxygenationCerebral blood flowSIGNAL (programming language)Dynamics (music)Blood volumeOxygenChemistryNuclear magnetic resonanceNeuroscienceBiomedical engineeringCardiologyAnesthesiaFunctional magnetic resonance imagingMedicineBiologyPsychologyComputer sciencePhysics
MeSH Terms
Blood GlucoseBlood VolumeBrainDeoxyglucoseDominanceCerebralElectroencephalographyHumansImage ProcessingComputer-AssistedMagnetic Resonance ImagingModelsNeurologicalMotor ActivityOxygen ConsumptionPhantomsImagingReference ValuesSynaptic Transmission
Affiliated Institutions
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Publication Info
- Year
- 1998
- Type
- article
- Volume
- 39
- Issue
- 6
- Pages
- 855-864
- Citations
- 1679
- Access
- Closed
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Cite This
Richard B. Buxton,
Eric C. Wong,
Lawrence R. Frank
(1998).
Dynamics of blood flow and oxygenation changes during brain activation: The balloon model.
Magnetic Resonance in Medicine
, 39
(6)
, 855-864.
https://doi.org/10.1002/mrm.1910390602
Identifiers
- DOI
- 10.1002/mrm.1910390602
- PMID
- 9621908