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Related Concept Videos

Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

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...
Ultrasonography01:17

Ultrasonography

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 a...

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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Minimum variance ultrasonic imaging applied to an in situ sparse guided wave array.

James Hall1, Jennifer E Michaels

  • 1School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|October 5, 2010
PubMed
Summary

Minimum Variance Distortionless Response (MVDR) imaging enhances ultrasonic guided wave imaging by reducing noise and artifacts. This advanced technique improves damage detection and localization over large areas.

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Area of Science:

  • Non-destructive testing
  • Ultrasonic imaging
  • Signal processing

Background:

  • Sparse ultrasonic arrays enable damage detection over large areas.
  • Conventional delay-and-sum imaging suffers from high noise and artifacts, hindering damage discrimination.

Purpose of the Study:

  • To investigate the efficacy of Minimum Variance Distortionless Response (MVDR) imaging for enhancing ultrasonic guided wave imaging.
  • To improve image quality and damage localization compared to conventional methods.

Main Methods:

  • Adaptive computation of weighting coefficients at each pixel location in MVDR imaging.
  • Incorporation of a priori scattering information, phase information, and instantaneous windowing into the MVDR method.

Main Results:

  • MVDR imaging significantly improves image quality over delay-and-sum imaging.
  • Simulated and experimental data from a through-hole scatterer demonstrate improved performance and imaging efficacy.
  • A proposed performance metric allows for quantitative image comparisons.

Conclusions:

  • MVDR imaging offers a substantial improvement for ultrasonic guided wave imaging applications.
  • The enhanced MVDR method provides superior damage detection and localization capabilities.
  • This technique holds promise for more reliable non-destructive evaluation over large areas.