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Computed Tomography01:10

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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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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Electron Tomography
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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Related Experiment Video

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Doppler Optical Coherence Tomography of Retinal Circulation
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Variations in optical coherence tomography resolution and uniformity: a multi-system performance comparison.

Anthony Fouad1, T Joshua Pfefer2, Chao-Wei Chen1

  • 1Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD, USA ; Fischell Department of Bioengineering, University of Maryland, College Park, MD, USA.

Biomedical Optics Express
|July 30, 2014
PubMed
Summary

Point spread function (PSF) phantoms using gold or iron oxide nanoparticles effectively compare optical coherence tomography (OCT) system resolution and uniformity. These phantoms enable objective, quantitative assessment of OCT performance across different systems.

Keywords:
(110.3000) Image quality assessment(110.4850) Optical transfer functions(170.4500) Optical coherence tomography(350.4800) Optical standards and testing

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Area of Science:

  • Optical imaging
  • Metrology
  • Nanotechnology

Background:

  • Point spread function (PSF) phantoms are crucial for evaluating optical coherence tomography (OCT) system resolution.
  • Standardized, objective methods are needed for comparing OCT system performance.

Purpose of the Study:

  • To evaluate three types of PSF phantoms for comparing the performance of four OCT systems.
  • To assess the phantoms' ability to measure resolution and signal uniformity across image volumes.

Main Methods:

  • Utilized PSF phantoms with gold nanoshells (260 nm), iron oxide particles (400 nm), and silica particles (1.5 µm).
  • Tested four OCT systems: spectral-domain, swept-source, and time-domain (free-beam and fiberoptic probe).
  • Quantified resolution, PSF shape variation, and signal intensity uniformity.

Main Results:

  • Iron oxide and gold nanoshell phantoms effectively measured spatial variations in PSF magnitude and shape.
  • Individual particle intensity evaluated signal intensity uniformity across OCT systems.
  • Quantified significant system-to-system differences in resolution and uniformity, identifying irregularities like astigmatism.

Conclusions:

  • PSF phantoms are practical tools for quantitative, objective inter-comparison of OCT system resolution and signal uniformity.
  • The evaluated phantoms demonstrate utility for characterizing OCT performance and identifying system-specific issues.