Estimating Cerebral Oxygen Metabolism From FMRI With A Dynamic Multicompartment Windkessel Model
One promising method for mapping CMRO2 is dual-calibrated functional MRI (dc-fMRI). This methodology exploits the Fick Principle to mix estimates of resting CBF from ASL, BloodVitals SPO2 and resting OEF derived from Bold-ASL measurements throughout arterial O2 and CO2 modulations. Multiple gasoline modulations are required to decouple OEF and deoxyhemoglobin-delicate blood quantity. We suggest an alternate single gasoline calibrated fMRI framework, integrating a mannequin of oxygen transport, that hyperlinks blood volume and CBF to OEF and creates a mapping between the maximum Bold sign, CBF, and OEF (and CMRO2). Simulations demonstrated the method's viability within mitochondrial oxygen strain, PmO2, and monitor oxygen saturation mean capillary transit time physiological ranges. A dc-fMRI experiment, performed on 20 healthy topics utilizing alternating O2 and CO2 challenges, was used to validate the strategy. The validation conveyed anticipated estimates of mannequin parameters (e.g., low PmO2), with stable OEF maps (gray matter, BloodVitals SPO2 GM, OEF Standard Deviation≈0.13). 0.025 respectively). The simplified calibrated fMRI technique using hypercapnia holds promise for clinical application.
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