Oxygen Extraction Fraction

Oxygen Extraction Fraction (OEF) is a measure that shows how efficiently the brain or other tissues take in oxygen from the blood. When blood flows through, it carries oxygen; OEF indicates what percentage of that oxygen is removed by the tissue before the blood continues on. A higher OEF means the tissue is extracting more oxygen, possibly due to increased demand or reduced blood flow, while a lower OEF suggests less oxygen is being extracted, which could indicate problems like impaired blood supply or tissue damage. It's a useful indicator of tissue health and function in medical assessments.