Direct Experimental Evidence of the Two Extravascular Compartments Contribution to the BOLD Signal

Keywords

absent according acquisition agreement allows applied approved approximation around asterisks attenuation beyond bias blood body bold brain cellular channel coefficient coil combination compartment compartments complicated complicates consequently consideration considering constant contain contribute contribution counted critical cubic decreases dependence depends describes deviation diffusion direct effective eliminated even evidence exhibits existence expanded experiment experimental experimentally explained extra extraction fact field fitting fraction framework frequency function functions furthermore gradient half head healthy ideal indeed induced inhomogeneities inset institutional intra intracellular introduce introduced linear macroscopic measured medicine model models needed negative network noted numerous obscure obviously oxygen part physics pixels polynomial position positive practically presence previous problem proof properties prove publications quantitative radiology receive recently reduces regime regression reports residual resolution respect sampling scanner selecting series serve sign simplify since smaller solid spacing spatial spin static straight structure studies substantially sufficiently supporting systematic taken theory third tissue transverse treat trio vessel volume volunteer whereas whole