What acts as a receiver that processes the echoes returning from inside the body in ultrasound?

• A. Antenna
• B. Transducer
• C. Monitor
• D. Probe

Answer: (B)

In ultrasound imaging, the device that acts as the receiver of echoes is the transducer. It contains piezoelectric crystals that convert electrical energy into acoustic pulses to probe the body. When those pulses hit tissues, echoes return and the same crystals pick up the returning vibrations, converting them back into electrical signals. The ultrasound system’s receiver then processes these signals (amplifying, filtering, demodulating, etc.) to create the image. The monitor merely displays the processed data, the antenna isn’t involved in medical ultrasound, and while a probe is the handheld part used to deliver the transducer, the essential echo reception and initial signal conversion happen in the transducer itself.