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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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Ultrasound II: Endoscopic Ultrasound and FibroScan

Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
Endoscopic Ultrasound (EUS):

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Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography
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Published on: May 10, 2022

Quantitative ultrasonic elastography for gel dosimetry.

Remo A Crescenti1, Jeffrey C Bamber, Assad A Oberai

  • 1Joint Department of Physics, Institute of Cancer Research and Royal Marsden NHS Foundation Trust, Sutton, Surrey, United Kingdom.

Ultrasound in Medicine & Biology
|December 1, 2009
PubMed
Summary
This summary is machine-generated.

Quantitative ultrasound elastography can image radiation dose distributions in polymer gels by measuring stiffness changes. This technique shows promise for accurate gel dosimetry, complementing magnetic resonance imaging (MRI).

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Biomedical Engineering

Background:

  • Advanced radiation therapy techniques require precise 3D dose verification.
  • Polymer gels change material properties upon irradiation, offering potential for dosimetry.
  • Previous studies confirmed dose-dependent changes in gel mechanical stiffness (Young's modulus).

Purpose of the Study:

  • To assess the feasibility of imaging radiation-induced stiffness distributions using quantitative ultrasound elastography.
  • To determine if the imaged stiffness distribution correlates with the radiation dose distribution.
  • To evaluate ultrasound elastography as a method for gel dosimetry.

Main Methods:

  • A methacrylic-acid-based polymer gel, seeded with ultrasound scatterers, was irradiated to create a defined stiff region.
  • Quantitative ultrasound elastography was employed, tracking gel displacement during compression to reconstruct shear modulus.
  • Inverse algorithms and parametric studies investigated the influence of regularization parameters and boundary conditions on stiffness reconstruction.

Main Results:

  • A radiation-induced stiffness distribution was successfully imaged using ultrasound elastography.
  • The reconstructed stiffness distribution showed a strong correlation with the known radiation dose distribution.
  • Optimal reconstruction parameters were crucial for quantitative stiffness measurement and accurate dose contrast, comparable to MRI.

Conclusions:

  • Quantitative ultrasound elastography is a viable method for mapping radiation dose distributions in polymer gels.
  • The technique demonstrates potential for accurate gel dosimetry, providing an alternative to MRI-based methods.
  • Further refinement of ultrasound elastography and inverse algorithms could establish this approach as a key tool in radiation dosimetry.