Aliasing in Doppler ultrasound occurs when the Doppler frequency shift exceeds what fraction of the pulse repetition frequency?

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Sharpen your skills for the Davies Publishing SPI Test with targeted flashcards and multiple-choice questions, complete with hints and clarifications. Prepare thoroughly for success!

Multiple Choice

Aliasing in Doppler ultrasound occurs when the Doppler frequency shift exceeds what fraction of the pulse repetition frequency?

Explanation:
Aliasing occurs because the Doppler signal is sampled at the pulse repetition frequency. The highest unambiguous frequency you can measure from that sampling is half the sampling rate (the Nyquist limit). If the Doppler frequency shift is larger than PRF/2, it wraps around and appears as a lower frequency in the opposite direction, causing aliasing. Therefore, the Doppler shift must be less than or equal to one-half of the pulse repetition frequency to avoid aliasing.

Aliasing occurs because the Doppler signal is sampled at the pulse repetition frequency. The highest unambiguous frequency you can measure from that sampling is half the sampling rate (the Nyquist limit). If the Doppler frequency shift is larger than PRF/2, it wraps around and appears as a lower frequency in the opposite direction, causing aliasing. Therefore, the Doppler shift must be less than or equal to one-half of the pulse repetition frequency to avoid aliasing.

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