Which material is commonly used for the piezoelectric elements in modern ultrasound transducers?

Which material is commonly used for the piezoelectric elements in modern ultrasound transducers?

• A. Tungsten powder and epoxy resin
• B. Quartz
• C. Lead zirconate titanate
• D. Rubber

Answer: (C)

Piezoelectric elements in ultrasound transducers are the active medium that converts electrical signals into mechanical vibrations to emit ultrasound, and then converts returning echoes back into electrical signals for imaging. Lead zirconate titanate is the material most commonly used for this purpose because it has a high piezoelectric coefficient and strong electromechanical coupling. That combination makes the element efficient at generating sound and sensitive to received echoes, which is crucial for clear, high-resolution imaging. It can be manufactured as thin, durable ceramics and shaped into the multiple elements and arrays found in modern probes, giving wide bandwidth and good performance across frequencies. Tungsten powder and epoxy resin are used for backing and damping to control the pulse and improve image quality, not as the active piezoelectric material. Quartz is a piezoelectric material, but its response is much weaker than PZT, resulting in lower sensitivity and bandwidth that aren’t ideal for contemporary broad-band medical imaging. Rubber doesn’t have piezoelectric properties, so it isn’t used as the active element.

Piezoelectric elements in ultrasound transducers are the active medium that converts electrical signals into mechanical vibrations to emit ultrasound, and then converts returning echoes back into electrical signals for imaging. Lead zirconate titanate is the material most commonly used for this purpose because it has a high piezoelectric coefficient and strong electromechanical coupling. That combination makes the element efficient at generating sound and sensitive to received echoes, which is crucial for clear, high-resolution imaging. It can be manufactured as thin, durable ceramics and shaped into the multiple elements and arrays found in modern probes, giving wide bandwidth and good performance across frequencies.

Tungsten powder and epoxy resin are used for backing and damping to control the pulse and improve image quality, not as the active piezoelectric material. Quartz is a piezoelectric material, but its response is much weaker than PZT, resulting in lower sensitivity and bandwidth that aren’t ideal for contemporary broad-band medical imaging. Rubber doesn’t have piezoelectric properties, so it isn’t used as the active element.