The type of imaging technique that a scientist would use to measure oxygen usage by the brain in a magnetic field is:

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fMRI (functional Magnetic Resonance Imaging) measures changes in blood oxygen levels in the brain in response to neural activity, providing a precise spatial and temporal resolution of brain function. This technique is commonly used to assess oxygen consumption and metabolic activity in the brain. NIRS (Near Infrared Spectroscopy) measures hemoglobin concentration changes, while EEG (Electroencephalography) measures electrical activity in the brain, both of which provide information about brain function but are less accurate in locating the source of activity. X-ray imaging is not suitable for measuring brain activity or oxygen usage.

The Type of Imaging Technique That a Scientist Would Use