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Imaging Studies for Cardiovascular System I:Echocardiography01:17

Imaging Studies for Cardiovascular System I:Echocardiography

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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.
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Imaging Studies for Cardiovascular System II:Types of Echocardiography01:20

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Echocardiography plays a role in assessing cardiac health and detecting heart conditions, with various types providing critical insights for diagnosis and treatment.
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Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Imaging Studies II: Ultrasonography01:24

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IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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Ultrasonic Assessment of Myocardial Microstructure
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Imaging of heart acoustic based on the sub-space methods using a microphone array.

Hanie Moghaddasi1, Farshad Almasganj1, Arezoo Zoroufian2

  • 1Biomedical Engineering Department, Amirkabir University of Technology, Tehran, Iran.

Computer Methods and Programs in Biomedicine
|July 10, 2017
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Summary

This study uses a microphone array and the Group Delay MUSIC algorithm to localize heart sound sources, offering a new diagnostic tool for cardiovascular disorders.

Keywords:
Acoustic imagingHeart soundsMicrophone arraySource localizationSub-space method

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Area of Science:

  • Biomedical Engineering
  • Acoustics
  • Cardiology

Background:

  • Heart disease is a leading global cause of death.
  • Phonocardiogram (PCG) captures heart sounds but lacks source localization.
  • Analyzing PCG with spatiotemporal information is crucial for understanding heart function.

Purpose of the Study:

  • To develop a method for localizing heart sound sources using a microphone array.
  • To investigate the spatial distribution of acoustic sources within the heart during a cardiac cycle.
  • To enhance the diagnostic potential of phonocardiography through acoustic mapping.

Main Methods:

  • Utilized a six-microphone array placed on the human chest for data acquisition.
  • Employed the Group Delay MUSIC algorithm, a subspace-based localization technique.
  • Estimated source locations of heart sounds (S1 and S2) during different cardiac phases.

Main Results:

  • Achieved a mean error of 0.14cm for S1 simulator sources and 0.21cm for S2 simulator sources.
  • Generated acoustic maps showing distinct patterns for various cardiac cycle phases.
  • Validated source locations against 4D echocardiography in a human case.

Conclusions:

  • Heart acoustic imaging offers a novel perspective on cardiovascular system acoustics.
  • This technique can potentially identify disorders of the heart valves.
  • Future applications may include a new diagnostic tool for cardiovascular conditions.