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Related Concept Videos

Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Measurements of Strain01:27

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
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Transformation of Plane Strain01:12

Transformation of Plane Strain

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Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
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Speckle reduction in optical coherence tomography by strain compounding.

Brendan F Kennedy1, Timothy R Hillman, Andrea Curatolo

  • 1Optical+Biomedical Engineering Laboratory, School of Electrical, Electronic and Computer Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia. brendank@ee.uwa.edu.au

Optics Letters
|July 17, 2010
PubMed
Summary

This study introduces a novel speckle reduction method for optical coherence tomography (OCT) using strain compounding. The technique effectively reduces image noise by averaging multiple scans with controlled strain variations.

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Area of Science:

  • Biomedical Optics
  • Medical Imaging Technology

Background:

  • Speckle noise is a significant artifact in optical coherence tomography (OCT) images, degrading image quality and hindering diagnostic accuracy.
  • Existing speckle reduction methods often involve trade-offs between noise reduction and image resolution.

Purpose of the Study:

  • To develop and validate a novel speckle reduction technique for OCT based on strain compounding.
  • To quantify the effectiveness of strain compounding in reducing speckle noise in OCT images.

Main Methods:

  • A speckle reduction technique was developed by introducing controlled decorrelation between successive B-scans through sample strain alteration.
  • A theoretical framework using transfer-function formalism was established to describe the strain compounding process.
  • Experimental validation was performed using silicone phantoms, acquiring multiple B-scans with incremental strain variations.

Main Results:

  • Nearly complete decorrelation of speckle patterns was achieved with a strain variation of 0.045.
  • A 1.5-fold reduction in speckle contrast ratio was observed when averaging nine B-scans with 0.003 strain increments.

Conclusions:

  • Strain compounding is an effective method for reducing speckle noise in OCT.
  • This technique offers a promising approach to enhance OCT image quality without compromising resolution.