What imaging technique uses radio waves and a very strong magnetic field to produce images of soft tissue?

• A. MRI scan
• B. CT scan
• C. X-ray
• D. Ultrasound

Answer: (A)

The main idea is recognizing an imaging technique that uses radio waves and a strong magnetic field to visualize soft tissues. In this method, a powerful magnet aligns the body's hydrogen protons. A radiofrequency pulse briefly disturbs that alignment, and as the protons return to normal, they emit signals that are captured and turned into detailed images. This approach provides excellent contrast between different soft tissues, like brain, nerves, muscles, and ligaments, and it does so without using ionizing radiation. Other common imaging options rely on X-rays or ultrasound: CT and X-ray use ionizing radiation and emphasize density differences, while ultrasound uses sound waves instead of magnetic fields.