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Measuring blood flow

Two brain imaging techniques, PET and fMRI, measure blood flow through the brain. Active areas of the brain use more energy and so need a greater supply of oxygen and glucose. More blood is directed to these areas to meet the demands of the active neurones. PET tracks blood flow by using labelled chemicals, while fMRI monitors the oxygen content of the blood.

Imaging techniques such as fMRI measure blood flow through the brain.
Imaging techniques such as fMRI measure blood flow through the brain.
Oxford Centre for Functional Magnetic Resonance Imaging of the Brain

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