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Related Concept Videos

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...
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...

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Three-dimensional Optical-resolution Photoacoustic Microscopy
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Published on: May 3, 2011

Ultrasonic imaging using a computed point spread function.

Ramsharan Rangarajan1, C V Krishnamurthy, Krishnan Balasubramaniam

  • 1Department of Mechanical Engineering, Stanford University, Stanford, CA 94205, USA. r.ramsharan@gmail.com

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|March 13, 2008
PubMed
Summary
This summary is machine-generated.

A new frequency domain point spread function (PSF) evaluator enhances ultrasonic imaging. This method improves image resolution and reflector size estimation in pulse-echo mode for various transducer types.

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Area of Science:

  • Non-destructive testing
  • Ultrasonic imaging
  • Acoustic field analysis

Background:

  • Accurate characterization of ultrasonic transducer performance is crucial for reliable non-destructive testing.
  • The point spread function (PSF) is a key metric for evaluating imaging system resolution.
  • Existing methods for PSF evaluation can be complex and computationally intensive.

Purpose of the Study:

  • To develop an explicit frequency domain point spread function (PSF) evaluator for ultrasonic transducers in pulse-echo mode.
  • To assess the PSF's impact on image quality and reflector characterization in single and multi-medium environments.
  • To compare the performance of different transducer types (planar, focused, annular) for optimal imaging.

Main Methods:

  • Utilized the patch element model for transducer field determination and scattered field assessment from a point reflector.
  • Evaluated the PSF in near and far fields for planar transducers in single and two-media configurations.
  • Employed an effective single-medium path length concept to model PSF across planar interfaces.
  • Computed PSFs and modulation transfer functions (MTFs) for planar, spherical focused, and annular transducers.

Main Results:

  • Successfully deconvolved and restored experimental surface and subsurface images of circular reflectors.
  • Developed a calibration plot for direct estimation of reflector diameters, eliminating the need for deconvolution.
  • Demonstrated that the PSF in a two-media scenario can be derived from a single-medium model.
  • Identified optimal imaging distances for enhanced resolution across different transducer geometries.

Conclusions:

  • The developed frequency domain PSF evaluator provides an effective tool for ultrasonic imaging analysis.
  • The method enables accurate image restoration and reflector characterization, even in the presence of planar interfaces.
  • Understanding and applying PSF analysis aids in selecting appropriate transducers and imaging parameters for improved non-destructive testing applications.