NSCI 201 Chapter Notes -Bureau Of International Expositions, Anaerobic Glycolysis, Earby
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Summary almost all fmri studies rely on an endogenous measure: bold contrast early research found that deoxygenated hb is paramagnetic and altered the t2* properties of nearby tissue. Pet fmri fmri: fmri spatial resolution determines our ability to separate adjacent brain regions with different functional properties collecting data using smaller voxels improves the spatial resolution (cost of inc. spatial resolution, is a dec. Bold signal) the vascular systems" organization and response properties introduce spatial constraints fmri temporal resolution ability to estimate the timing of neuronal activity from the measured hemodynamic changes using a short repetition time improves temporal resolution. Allows imaging of anything that can be tagged. Expensive and time-consuming energy is supplied to the brain via the vascular system more hemoglobin is supplied than needed, causing a decrease in deoxygenated hemoglobin. Deoxygenated hemoglobin reduces some forms (t*) of mr signal.