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Related Concept Videos

Computed Tomography01:10

Computed Tomography

9.0K
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...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed 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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Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

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Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
395
Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

391
DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
391
Positron Emission Tomography01:29

Positron Emission Tomography

7.7K
Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
7.7K
Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

488
Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
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Related Experiment Video

Updated: Feb 17, 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 angiography.

Richard F Spaide1, James G Fujimoto2, Nadia K Waheed3

  • 1Vitreous, Retina, Macula Consultants of New York, New York, NY, United States.

Progress in Retinal and Eye Research
|December 13, 2017
PubMed
Summary
This summary is machine-generated.

Optical coherence tomography angiography (OCTA) offers detailed retinal and choroidal blood flow imaging, advancing ophthalmic diagnostics. This review covers OCTA

Keywords:
Multimodal imagingOptical coherence tomographyOptical coherence tomography angiography

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Optical coherence tomography (OCT) revolutionized ophthalmic imaging.
  • OCT angiography (OCTA) builds upon OCT, providing unprecedented depth-resolved visualization of retinal and choroidal vasculature.
  • Despite its youth (around 10 years), OCTA presents challenges due to new technology, processing, and evolving understanding of retinal pathophysiology.

Purpose of the Study:

  • To provide a comprehensive overview of OCT angiography (OCTA).
  • To detail the historical development, methodologies, and interpretation of OCTA images.
  • To review the clinical applications of OCTA in various posterior segment diseases.

Main Methods:

  • Historical review of OCTA development.
  • Explanation of OCTA signal processing, image generation, and display techniques.
  • Review of ocular anatomy and vascular layer imaging with OCTA.

Main Results:

  • OCTA surpasses older imaging modalities in visualizing retinal and choroidal blood flow.
  • Understanding OCTA requires knowledge of its technical basis to interpret images and identify artifacts.
  • The review integrates OCTA findings across diverse ophthalmic conditions.

Conclusions:

  • OCTA is a transformative technology in ophthalmology.
  • Its clinical adoption and research utility are rapidly expanding.
  • OCTA is crucial for understanding the pathophysiology of posterior pole diseases.