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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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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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Imaging Biological Samples with Optical Microscopy01:18

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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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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Updated: Jan 31, 2026

Doppler Optical Coherence Tomography of Retinal Circulation
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Doppler Optical Coherence Tomography of Retinal Circulation

Published on: September 18, 2012

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Optical Coherence Tomography.

Stephen H Tsang1,2, Tarun Sharma3

  • 1Jonas Children's Vision Care, Bernard & Shirlee Brown Glaucoma Laboratory, Columbia Stem Cell Initiative-Departments of Ophthalmology, Biomedical Engineering, Pathology & Cell Biology, Institute of Human Nutrition, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA.

Advances in Experimental Medicine and Biology
|December 23, 2018
PubMed
Summary
This summary is machine-generated.

Optical coherence tomography (OCT) has advanced retinal disease diagnosis. Newer OCT technologies offer faster, high-resolution imaging of the retina and choroid.

Keywords:
ChoroidOptical coherence tomographyRetina

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Area of Science:

  • Ophthalmology
  • Medical Imaging

Background:

  • Time-domain OCT (TD-OCT) introduced in the early 2000s revolutionized retinal disease understanding.
  • Spectral-domain OCT (SD-OCT) and swept-source OCT (SS-OCT) emerged mid-2000s onwards.
  • These advancements improved diagnostic capabilities for various ocular conditions.

Purpose of the Study:

  • To review the evolution of Optical Coherence Tomography (OCT) technologies.
  • To highlight the impact of OCT advancements on retinal disease management.
  • To discuss the benefits of high-resolution imaging in ophthalmology.

Main Methods:

  • Review of time-domain, spectral-domain, and swept-source OCT technologies.
  • Analysis of imaging speed and resolution improvements.
  • Discussion of clinical applications in retinal and choroidal imaging.

Main Results:

  • TD-OCT laid the foundation for OCT in ophthalmology.
  • SD-OCT and SS-OCT significantly increased imaging speed and resolution.
  • Enhanced visualization of retinal and choroidal structures was achieved.

Conclusions:

  • OCT technology has progressively improved diagnostic accuracy in ophthalmology.
  • Advanced OCT techniques enable better management of retinal diseases.
  • High-resolution imaging is crucial for understanding complex ocular pathologies.