Which imaging technique uses radio waves and a strong magnetic field to produce detailed brain images?

Which imaging technique uses radio waves and a strong magnetic field to produce detailed brain images?

• A. MRI
• B. PET scan
• C. CT scan
• D. EEG

Answer: (A)

MRI uses radio waves and a strong magnetic field to produce detailed brain images. A strong magnetic field aligns the hydrogen protons in brain tissue, and a radiofrequency pulse briefly perturbs them. When the protons return to alignment, they emit signals that are turned into high-resolution images, highlighting soft tissues like gray and white matter. This technique provides excellent anatomical detail without ionizing radiation. Functional MRI is a related application that tracks blood flow during activity, but the basic idea described is anatomical MRI. Other imaging methods differ: PET scans use radioactive tracers to map metabolism, CT scans use X-rays to image structures, and EEG records electrical activity rather than creating detailed brain images.

MRI uses radio waves and a strong magnetic field to produce detailed brain images. A strong magnetic field aligns the hydrogen protons in brain tissue, and a radiofrequency pulse briefly perturbs them. When the protons return to alignment, they emit signals that are turned into high-resolution images, highlighting soft tissues like gray and white matter. This technique provides excellent anatomical detail without ionizing radiation. Functional MRI is a related application that tracks blood flow during activity, but the basic idea described is anatomical MRI. Other imaging methods differ: PET scans use radioactive tracers to map metabolism, CT scans use X-rays to image structures, and EEG records electrical activity rather than creating detailed brain images.