Pulse repetition frequency

Last revised by Sajanakan Sriselvakumar on 6 Dec 2022

Pulse repetition frequency (PRF) indicates the number of ultrasound pulses emitted by the transducer over a designated period of time. It is typically measured as cycles per second or hertz (Hz). In medical ultrasound the typically used range of PRF varies between 1 and 10 kHz 1. PRF is limited by the maximum depth (R) to be sampled and the acoustic velocity of the medium (c).

PRFmax= acoustic velocity/maximum depth to be sampled x 2 ( c/2R)

A number of artifacts are directly influenced by the pulse repetition frequency, e.g. increasing it diminishes the aliasing artifact commonly encountered during color and spectral Doppler imaging, while decreasing it facilitates e.g. the display of the useful twinkling artifact occurring behind stones and calcifications 2

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