Which is not a part of the transducer?

Which is not a part of the transducer?

• A. active crystal
• B. matching layer
• C. A/D converter
• D. wire

Answer: (C)

The transducer is built around the active piezoelectric element that converts electrical energy into sound and back. The matching layer sits on or near that crystal to lessen the impedance gap between crystal and tissue, improving energy transfer and bandwidth. The wire provides the essential electrical connection from the probe to the imaging system. The A/D converter, however, is part of the system’s signal processing chain; it digitizes the analog echoes after amplification and other receiver stages. That’s why the A/D converter is not considered a component of the transducer itself.

The transducer is built around the active piezoelectric element that converts electrical energy into sound and back. The matching layer sits on or near that crystal to lessen the impedance gap between crystal and tissue, improving energy transfer and bandwidth. The wire provides the essential electrical connection from the probe to the imaging system. The A/D converter, however, is part of the system’s signal processing chain; it digitizes the analog echoes after amplification and other receiver stages. That’s why the A/D converter is not considered a component of the transducer itself.