ASL
Also written as: ASL — Arterial Spin Labeling
Arterial spin labeling, a non-invasive MRI technique for measuring cerebral blood flow using magnetically labeled arterial blood.
Full Definition
Arterial spin labeling (ASL) is a magnetic resonance imaging technique that measures cerebral perfusion by magnetically labeling arterial blood water as an endogenous tracer. Unlike contrast-enhanced perfusion methods, ASL requires no exogenous contrast agents, making it ideal for pediatric populations and repeated measurements. The technique provides quantitative cerebral blood flow maps and is particularly valuable in stroke assessment, dementia evaluation, and functional brain studies where perfusion changes reflect neural activity.
Usage
Usage note: Distinguish from other ASL meanings in medical contexts; always specify as perfusion technique
In Context
- "ASL perfusion imaging demonstrated hypoperfusion in the left temporal lobe without contrast administration." — Pediatric stroke evaluation
- "The pseudocontinuous ASL sequence provided reliable cerebral blood flow quantification across multiple time points." — Longitudinal dementia study methodology