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Related Concept Videos

Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

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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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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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Ultrasonic Imaging of High-contrasted Objects Based on Full-waveform Inversion: Limits under Fluid Modeling.

Luis Espinosa1, Elise Doveri1, Simon Bernard2

  • 1Aix-Marseille Université, CNRS, Centrale Marseille, LMA, Marseille, France.

Ultrasonic Imaging
|February 10, 2021
PubMed
Summary
This summary is machine-generated.

Full Waveform Inversion (FWI) precisely images hard tissues using ultrasound, even with fluid medium assumptions. This study evaluates FWI

Keywords:
acousticscomputed tomographyfull-waveform inversionimagingultrasound

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Area of Science:

  • Biomedical Engineering
  • Acoustics
  • Materials Science

Background:

  • Quantitative ultrasound excels at imaging hard tissues due to acoustic impedance contrast.
  • Full Waveform Inversion (FWI) is a powerful inverse problem-solving method for wave-medium interactions.

Purpose of the Study:

  • To assess the precision of FWI for imaging test targets with high acoustic impedance contrast.
  • To evaluate the impact of assuming a fluid medium on reconstruction accuracy, especially with varying shear wave attenuation.

Main Methods:

  • Utilized Full Waveform Inversion (FWI) to process experimental ultrasound data.
  • Employed high-resolution numerical modeling of wave propagation, simplifying the medium to a fluid.
  • Analyzed sound speed reconstruction accuracy across materials with different shear wave attenuation levels.

Main Results:

  • Generated sound speed images from experimental data using FWI.
  • Evaluated the precision of the reconstruction under the fluid medium assumption.
  • Identified limitations related to shear wave attenuation in the simplified model.

Conclusions:

  • FWI demonstrates potential for imaging high acoustic impedance contrast materials.
  • The fluid medium assumption in FWI requires careful consideration regarding shear wave attenuation.
  • Further research should incorporate viscoelastic properties for more comprehensive modeling.