What is one of the greatest advantages of fMRI scans compared to PET scans?

• A. They show neurotransmitter receptors clearly
• B. They pose no danger from radiation exposure
• C. They can be easily performed on all patients
• D. They require no specialized equipment

Answer: (B)

One of the significant advantages of fMRI scans compared to PET scans is that fMRI poses no danger from radiation exposure. fMRI, or functional magnetic resonance imaging, uses powerful magnets and radio waves to measure brain activity by detecting changes in blood flow and oxygenation levels. Since it does not involve ionizing radiation, it is considered safer for repeated use, making it suitable for longitudinal studies and for use in sensitive populations, such as children and pregnant women.

In contrast, PET scans require the injection of radioactive tracers to visualize brain activity, which involves exposure to radiation. This exposure can have cumulative effects, and therefore, the safety of patients limits how often PET scans can be performed.

Highlighting this distinction underscores the importance of safety in neuroimaging techniques and reflects why fMRI is often preferred in clinical and research settings where monitoring brain function is necessary without the associated risks of radiation.