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Related Concept Videos

Imaging Studies for Cardiovascular System I:Echocardiography01:17

Imaging Studies for Cardiovascular System I:Echocardiography

Cardiac imaging studies encompass a wide range of noninvasive and minimally invasive techniques designed to visualize the heart's structure and function in detail. One such technique is echocardiography, which uses high-frequency ultrasound waves to produce detailed images of the heart, known as echocardiograms.
Indications: Echocardiography is utilized to diagnose heart failure, valve disorders, and myocardial infarction. It also assesses cardiac structures' size, shape, and motion, evaluates...
Imaging Studies for Cardiovascular System II:Types of Echocardiography01:20

Imaging Studies for Cardiovascular System II:Types of Echocardiography

Echocardiography plays a role in assessing cardiac health and detecting heart conditions, with various types providing critical insights for diagnosis and treatment.
Types of Echocardiography
Transthoracic Echocardiography (TTE)
TTE is the most common type of echocardiogram which involves placing a transducer on the patient's chest, emitting sound waves to create heart images. TTE is invaluable for evaluating the heart's size, structure, and motion, making it particularly useful for diagnosing...

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Related Experiment Video

Updated: Jul 8, 2026

Assessing Intracardiac Vortices with High Frame-Rate Echocardiography-Derived Blood Speckle Imaging in Newborns
07:13

Assessing Intracardiac Vortices with High Frame-Rate Echocardiography-Derived Blood Speckle Imaging in Newborns

Published on: December 22, 2023

Non-contact Heart Sound Measurement by Defocused Speckle Imaging.

Zhiqin Zhou, Yingen Zhu, Ningbo Zhao

    IEEE Journal of Biomedical and Health Informatics
    |July 6, 2026
    PubMed
    Summary

    A novel camera-stethoscope uses defocused speckle imaging to record phonocardiograms (heart sounds) contactlessly. This technology shows high accuracy in detecting heart sound events, offering potential for early cardiovascular disease screening.

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    Published on: July 9, 2010

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    High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
    11:50

    High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart

    Published on: July 9, 2010

    Area of Science:

    • Biomedical Optics
    • Medical Instrumentation
    • Cardiovascular Diagnostics

    Background:

    • Phonocardiogram (PCG) is crucial for early cardiovascular disease (CVD) screening.
    • Current methods often require direct physical contact.
    • Non-contact methods for PCG acquisition are highly desirable.

    Purpose of the Study:

    • To develop and validate a novel contactless camera-stethoscope system for PCG recording.
    • To investigate the use of defocused speckle imaging (DSI) for measuring cardiac vibrations.
    • To establish algorithms for accurate PCG signal extraction and heart sound event detection.

    Main Methods:

    • Utilized defocused speckle imaging (DSI) by illuminating the chest and capturing reflected laser speckle with a defocused camera.
    • Developed an algorithm for extracting PCG signals and detecting S1 and S2 heart sound events from video.
    • Validated the system against a contact electronic stethoscope in laboratory and clinical settings.

    Main Results:

    • Demonstrated adjustable amplification of heart sounds by modifying the camera's defocused level.
    • Achieved high F1-scores (0.94) for S1 and S2 detection in clinical validation with 45 patients.
    • Confirmed the reliability and clinical potential of the contactless camera-stethoscope.

    Conclusions:

    • The camera-stethoscope, based on DSI, offers a reliable non-contact method for PCG monitoring.
    • This technology has significant potential for improving early screening and prevention of CVDs.
    • Established fundamental optical sensing models and algorithms for advanced PCG monitoring.