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Related Concept Videos

Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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Doppler Effect - II01:05

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Related Experiment Video

Updated: Dec 30, 2025

Home-Based Monitor for Gait and Activity Analysis
07:24

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Published on: August 8, 2019

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Doppler Radar System for In-Home Gait Characterization using Wavelet Transform Analysis.

Racha Soubra, Aly Chkeir, Farah Mourad-Chehade

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 18, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces Doppler radar and continuous wavelet transform (CWT) for assessing older adults' walking speed at home. Daubechies5 and Symlets7 wavelets demonstrated high accuracy for gait characterization, validating the system for gerontology research.

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    Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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    Area of Science:

    • Gerontology
    • Biomedical Engineering
    • Signal Processing

    Background:

    • Walking speed is a key indicator of health and functional status in older adults.
    • Accurate gait characterization is crucial for monitoring aging populations.
    • Current methods may lack convenience for continuous in-home monitoring.

    Purpose of the Study:

    • To propose and validate a Doppler radar system for in-home gait characterization.
    • To identify optimal mother wavelets for continuous wavelet transform (CWT) analysis of gait data.
    • To assess the accuracy of radar-based gait speed measurement against a gold standard.

    Main Methods:

    • Utilized a Doppler radar system for gait data acquisition.
    • Applied continuous wavelet transform (CWT) analysis with various mother wavelets.
    • Validated gait speed measurements against a 3D motion-capture system (Vicon).
    • Computed Pearson Correlation coefficient (ρ) and mean square error (MSE) for validation.

    Main Results:

    • Daubechies5 and Symlets7 wavelets showed high correlation (ρ=0.86 and ρ=0.85, respectively) with Vicon data.
    • Mean square error was consistently below 0.05 m/s for the suggested wavelets.
    • The Doppler radar system effectively characterized gait speed in an experimental setting.

    Conclusions:

    • Doppler radar combined with CWT offers a viable method for in-home gait speed assessment.
    • Daubechies5 and Symlets7 are recommended mother wavelets for this application.
    • This technology has potential for remote health monitoring in gerontology.