BOLD (Blood Oxygen Level-Dependent) contrast

BOLD (Blood Oxygen Level-Dependent) contrast is a technique used in functional MRI (fMRI) scans to measure brain activity. When a part of the brain is active, it consumes more oxygen, prompting nearby blood vessels to supply more oxygen-rich blood. This change in blood oxygen levels affects the magnetic properties of the blood, allowing the fMRI to detect where activity is happening in the brain. Essentially, BOLD contrast helps researchers and doctors visualize which areas of the brain are involved in specific tasks or responses, aiding in understanding brain function and diagnosing neurological conditions.