Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

A tracking FFT processor for pulsed Doppler analysis beyond the Nyquist limit.

P Tortoli

    IEEE Transactions on Bio-Medical Engineering
    |February 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Computationally Efficient SVD Filtering for Ultrasound Flow Imaging and Real-Time Application to Ultrafast Doppler.

    IEEE transactions on bio-medical engineering·2024
    Same author

    Surgeon eye lens dose monitoring in interventional neuroradiology, cardiovascular and radiology procedures.

    Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)·2022
    Same author

    Improving patient waiting time of centralized front office service in a regional hub hospital using the discrete event simulation model.

    Technology and health care : official journal of the European Society for Engineering and Medicine·2020
    Same author

    A real-time chirp-coded imaging system with tissue attenuation compensation.

    Ultrasonics·2015
    Same author

    Flow imaging with pulsed Doppler ultrasound and flow phantoms.

    IEEE transactions on ultrasonics, ferroelectrics, and frequency control·2008
    Same author

    Quantitative analysis of Doppler spectrum modifications yielded by contrast agents insonified at high pressure.

    IEEE transactions on ultrasonics, ferroelectrics, and frequency control·2008

    This study introduces a novel ultrasound Doppler signal processing method to accurately track frequencies exceeding the Nyquist limit. The technique uses data reordering based on spectral parameters for real-time Doppler spectrum analysis.

    Area of Science:

    • Medical Imaging
    • Signal Processing
    • Ultrasound Technology

    Background:

    • Ultrasound pulsed Doppler systems are limited by the Nyquist frequency, causing aliasing for high velocities.
    • Accurate tracking of instantaneous frequencies beyond the Nyquist limit is crucial for comprehensive Doppler analysis.

    Purpose of the Study:

    • To present a new tracking procedure for ultrasound pulsed Doppler signals with instantaneous frequencies exceeding the Nyquist limit.
    • To enable real-time monitoring of the full Doppler spectrum and mean frequency over an extended range.

    Main Methods:

    • The procedure utilizes a frequency translation achieved by reordering digital fast Fourier transform (FFT) data.
    • The extent of data reordering is determined by a computed spectral parameter, such as the mean frequency.

    Related Experiment Videos

  • Modifications were implemented at the output of an FFT unit within a standard pulsed Doppler system.

    • Main Results:

    • The method successfully reconstructs aliased spectra by reordering FFT data.
    • Real-time tracking of the dynamic evolution of the complete Doppler spectrum and mean frequency was achieved.
    • The procedure demonstrated effectiveness across in vitro, in vivo, and test signal experiments.

    Conclusions:

    • The developed tracking procedure effectively overcomes the Nyquist limit in ultrasound pulsed Doppler.
    • This technique allows for enhanced real-time monitoring of Doppler signals, improving diagnostic capabilities.
    • The method offers a practical solution for analyzing high-frequency Doppler shifts in various applications.