Blood Oxygen Level-Dependent Functional MRI

**Semantic type:** Diagnostic Procedure

**Definition:** A magnetic resonance imaging technique that uses the difference between the magnetic signals of hemoglobin when it is carrying oxygen (oxyhemoglobin) and when it is not carrying oxygen (deoxyhemoglobin) to detect metabolic activity, and hence neurologic activity, in the brain.

**Synonyms:** - BLOOD OXYGEN LEVEL-DEPENDENT FUNCTIONAL MRI - BOLD - BOLD fMRI - BOLD fMRI - Blood Oxygen Level Dependent Functional Magnetic Resonance Imaging - Blood Oxygen Level Dependent Imaging - Blood Oxygen Level-Dependent fMRI