Which statement about imaging transducers is true?

Which statement about imaging transducers is true?

• A. They have narrow bandwidth.
• B. They have wide bandwidth.
• C. They lack backing material.
• D. They produce no image.

Answer: (B)

Bandwidth describes the range of frequencies a transducer can effectively emit and receive. Imaging transducers are designed with wide bandwidth so they can emit short pulses and listen over a broad frequency range. Short pulses give better axial resolution, and the broad frequency response supports multiple imaging modes, including Doppler and harmonic imaging. This wide bandwidth is achieved in part by backing material that damps the crystal and reduces ringing; without backing, the pulse would be longer and the bandwidth narrower. And of course, the transducer is what creates the echoes that form the image, so it definitely produces an image.

Bandwidth describes the range of frequencies a transducer can effectively emit and receive. Imaging transducers are designed with wide bandwidth so they can emit short pulses and listen over a broad frequency range. Short pulses give better axial resolution, and the broad frequency response supports multiple imaging modes, including Doppler and harmonic imaging. This wide bandwidth is achieved in part by backing material that damps the crystal and reduces ringing; without backing, the pulse would be longer and the bandwidth narrower. And of course, the transducer is what creates the echoes that form the image, so it definitely produces an image.