What is the method of ultrasound?

• A. X-rays
• B. Soundwaves
• C. MRI
• D. Radio waves

Answer: (B)

Ultrasound imaging uses high-frequency sound waves. A transducer acts as both emitter and receiver, sending brief sound pulses into the body and detecting echoes that bounce back from tissue interfaces. The time it takes for echoes to return and their strength are converted into real-time images. The frequencies used are well above human hearing, typically in the megahertz range, which allows safe, live visualization of organs and soft tissues. This method has no ionizing radiation, unlike X-rays. MRI, on the other hand, relies on strong magnetic fields and radiofrequency pulses, not sound waves, to form images. Radio waves are involved in MRI as part of signal processing, not the primary imaging method. So the method described is based on sound waves.