Arterial Spin Labeling Magnetic Resonance Imaging Arterial Spin Labeling Magnetic Resonance Imaging Arterial Spin Labeling MRI An application of functional MRI used to measure cerebral blood flow. ASL uses magnetically labeled water as the tracer. ASL C116450 Diagnostic Procedure ASL fMRI Arterial Spin Labeling Magnetic Resonance Imaging Arterial Spin Labeling Magnetic Resonance Imaging A noninvasive fMRI technique that uses arterial water as an endogenous tracer to measure cerebral blood flow by magnetically labeling the proton spins of the arterial water prior to reaching the imaged volume. CDISC CL446664 ARTERIAL SPIN LABELING FUNCTIONAL MRI CTRP Magnetic Resonance Imaging