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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.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

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.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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...
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...
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
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

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Related Experiment Video

Updated: May 30, 2026

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
11:21

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Published on: January 15, 2013

Enhanced depth imaging optical coherence tomography.

Ian Y Wong1, Hideki Koizumi, Wico W Lai

  • 1Eye Institute, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong, ROC. ianyhwong@gmail.com

Ophthalmic Surgery, Lasers & Imaging : the Official Journal of the International Society for Imaging in the Eye
|July 28, 2011
PubMed
Summary
This summary is machine-generated.

Enhanced Depth Imaging Optical Coherence Tomography (EDI-OCT) offers improved visualization of the choroid, overcoming limitations of conventional spectral-domain optical coherence tomography (SD-OCT). This review explores its principles, applications, and future potential in choroidal imaging.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Conventional spectral-domain optical coherence tomography (SD-OCT) faces challenges in imaging the choroid due to signal attenuation beyond the retinal pigment epithelium.
  • The choroid, a vascular layer, is crucial for retinal health and its imaging is vital for diagnosing various ocular diseases.

Purpose of the Study:

  • To review the technique, underlying principles, and recent advancements in Enhanced Depth Imaging Optical Coherence Tomography (EDI-OCT).
  • To discuss the application of EDI-OCT in diagnosing retinal and choroidal diseases.
  • To explore the potential future developments of EDI-OCT technology.

Main Methods:

  • A comprehensive MEDLINE search was conducted for all published articles on EDI-OCT up to December 2010.
  • The review discusses the fundamental principles of EDI-OCT.
  • Modifications in image acquisition techniques for EDI-OCT are described and illustrated.

Main Results:

  • EDI-OCT, a modification of SD-OCT, enables clearer imaging of the choroid.
  • The review covers EDI-OCT findings in a range of retinal and choroidal pathologies.
  • Advantages and limitations of the EDI-OCT technique are discussed.

Conclusions:

  • EDI-OCT is a promising new technique for visualizing the choroid.
  • It significantly improves upon the limitations of conventional SD-OCT for choroidal imaging.
  • Further development holds potential for enhanced diagnostic capabilities in ophthalmology.