What technology utilizes a series of magnetic resonance images to study brain activity?

• A. Positron emission tomography
• B. Computed tomography
• C. Functional magnetic resonance imaging
• D. Electroencephalography

Answer: (C)

Functional magnetic resonance imaging (fMRI) is the correct answer because it specifically measures and assesses brain activity by detecting changes in blood flow. When a certain area of the brain is active, it consumes more oxygen, which is delivered through increased blood flow. fMRI exploits these changes in blood flow and oxygenation, providing a dynamic view of brain function in real-time.

This technique generates a series of magnetic resonance images at rapid intervals, allowing researchers to observe how specific brain regions respond during various tasks or stimuli. The ability to correlate brain activity with cognitive functions or behaviors makes fMRI a powerful tool in both research and clinical settings.

In contrast, other imaging technologies listed measure different aspects of brain structure and function. Positron emission tomography (PET) uses radioactive tracers to visualize metabolic processes, computed tomography (CT) provides detailed images of brain structures but does not measure function, and electroencephalography (EEG) records electrical activity in the brain over time but does not use magnetic resonance imaging techniques. Thus, fMRI is uniquely positioned to provide insights into active brain function through its advanced imaging capabilities.