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  1. radiopaedia.org › articles › aliasing-phenomenon-ultrasoundAliasing phenomenon (ultrasound) | Radiology Reference Article...

    8 Jun 2024 · Aliasing is a phenomenon inherent to Doppler modalities which utilize intermittent sampling in which an insufficient sampling rate results in an inability to record direction and velocity accurately.

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  2. www.ncbi.nlm.nih.gov › pmc › articlesBasics for performing a high-quality color Doppler sonography of...

    28 Jul 2021 · A brief analysis of the Doppler inherent artefacts (as random noise, blooming, aliasing, and motion artefacts) and the adjustment setting to minimize or eliminate the confounding artefacts are also considered. Doppler aliasing occurs when the pulse repetition frequency is set too low.

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  4. johnsonfrancis.org › professional › aliasingAliasing and Nyquist limit in Doppler echocardiography

    16 Mei 2012 · Aliasing is a phenomenon in pulsed Doppler echocardiography in which when the velocity is beyond a particular limit known as the Nyquist limit, the direction of flow is depicted as opposite to that of the actual one. Nyquist limit is half the pulse repetition frequency of the ultrasound signal emitted by the Doppler transducer.

  5. epos.myesr.org › poster › esrDoppler artifacts - ECR 2019 EPOS

    Aliasing arises when the Doppler shift of the moving blood is greater than the Nyquist frequency (Nyquist frequency = pulse repetition frequency (PRF)/2). Aliasing is useful because it enables quick identification of high velocity flow in stenosed vessels or arteriovenous fistulas.

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  7. link.springer.com › chapter › 10Doppler Imaging: Basic Principles and Clinical Application

    9 Mac 2016 · An important limitation of pulsed Doppler is the incapability to correctly detect velocities higher than one-half PRF (Nyquist limit), resulting in a misinterpretation of the Doppler signal known as aliasing phenomenon. In fact, the time interval between sampling pulses must be sufficient for a pulse to make the return journey from the ...

  8. fetalmedicine.org › var › uploadsDoppler Ultrasound - Principles and practice - Fetal Medicine

    BASIC PRINCIPLES . Ultrasound images of flow, whether color flow or spectral Doppler, are essentially obtained from measurements of movement. In ultrasound scanners, a series of pulses is transmitted to detect movement of blood. Echoes from stationary tissue are the same from pulse to pulse.

  9. www.ajronline.org › doi › pdfplusIn Doppler sonography, what is aliasing, and how does it help ......

    invelocity produces higher Doppler frequency shifts than would occurinnormal-caliber vessels.Thesehigh-frequency shiftsmay alias,localizing thestenosis. Question JonathanM.Rubin University ofMichigan Hospital, AnnArbor,Ml What isthe role ofsonographic breast imaging fordetecting occultcancerinapatient withastrong family history ofbreast can-