Howtosignalprocessing
- What is the significance of pulse repetition frequency?
- What is range ambiguity in ultrasound?
- What causes range ambiguity?
- What is maximum range and pulse recurrence frequency?
What is the significance of pulse repetition frequency?
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.
What is range ambiguity in ultrasound?
Pulsed Doppler ultrasound (PW) can be used to determine the location of frequency shifts within the cardiac chambers or great vessels. However, it is possible to record similar frequency shifts at sample volume locations distal to their original site; this is referred to as range ambiguity (RA).
What causes range ambiguity?
In Synthetic Aperture Radar (SAR) imaging, range ambiguity is caused by the echoes of the previous and latter transmitted pulses scattered from undesired range zones [1].
What is maximum range and pulse recurrence frequency?
Rmax must be larger than the Maximum Display Range (so-called: instrumented range). Consider radar with pulse repetition frequency 1 000 Hz. The pulse period is its reciprocal value and is 1/ 1 000 = 1 ms. According to formula (2) the maximum unambiguous range of this radar is 150km.
