Single-crystal transducers have which advantage?

• A. Lower frequencies at higher resolution
• B. Absence of aliasing with pulsed Doppler
• C. Higher frame rates
• D. Wide bandwidth

Answer: (D)

Single-crystal transducers are valued for their broad bandwidth. The single-crystal piezoelectric material provides very high electromechanical coupling with low energy loss, allowing efficient generation and reception across a wide range of frequencies. This broad bandwidth enables short-duration pulses and the ability to use multiple frequency components, which improves axial resolution and supports techniques like harmonic imaging and multi-frequency operation.

Frame rate, Doppler aliasing, or the idea of lower frequencies at higher resolution aren’t inherent advantages of the transducer type. Frame rate depends on scanning and processing parameters; aliasing is a function of Doppler sampling rate and PRF; and higher resolution is achieved with higher, not lower, frequencies.