In pulsed ultrasound, which factor determines the sound wave frequency?

In pulsed ultrasound, which factor determines the sound wave frequency?

• A. Pulse Repetition Frequency
• B. Transmitter Frequency
• C. Area Of The Transducer Elements
• D. Pressure Applied To The Transducer

Answer: (B)

The sound-wave frequency is set by the transmitter’s drive frequency, which matches the transducer crystal’s resonant frequency. In other words, the electrical signal used to excite the crystal determines the frequency of the emitted ultrasound. Pulsed operation changes how often pulses are sent—pulse repetition frequency affects frame rate and depth sampling, not the frequency of the individual wave. The area of the transducer elements and the pressure applied influence beam shape, focus, and amplitude, but they do not change the frequency of the emitted sound.

The sound-wave frequency is set by the transmitter’s drive frequency, which matches the transducer crystal’s resonant frequency. In other words, the electrical signal used to excite the crystal determines the frequency of the emitted ultrasound. Pulsed operation changes how often pulses are sent—pulse repetition frequency affects frame rate and depth sampling, not the frequency of the individual wave. The area of the transducer elements and the pressure applied influence beam shape, focus, and amplitude, but they do not change the frequency of the emitted sound.