Which ultrasound system component is the handheld device that emits and collects echoes?

• A. Display Monitor
• B. Receiver
• C. Transducer
• D. Processor

Answer: (C)

In ultrasound imaging, the handheld probe that emits sound waves and then listens for the returning echoes is the transducer. Its crystals convert electrical energy into mechanical vibrations that generate ultrasound pulses sent into the body. When those pulses hit tissues, echoes return and are picked up by the same crystals, which then convert the echoes back into electrical signals for the system to process. The display monitor shows the image, the receiver amplifies and filters the incoming signals, and the processor constructs the final image from those signals. The transducer is the key handheld component that does the actual emission and reception.