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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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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.
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...
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Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

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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...
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Positron Emission Tomography01:29

Positron Emission Tomography

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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...
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Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

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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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Updated: Mar 18, 2026

Doppler Optical Coherence Tomography of Retinal Circulation
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Optical Coherence Tomography Angiography.

Simon S Gao, Yali Jia, Miao Zhang

    Investigative Ophthalmology & Visual Science
    |July 14, 2016
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    Summary
    This summary is machine-generated.

    Optical coherence tomography angiography (OCTA) provides noninvasive visualization of ocular blood vessels. This review covers OCTA history, clinical uses, and challenges, highlighting recent advancements for ophthalmologists.

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    Area of Science:

    • Ophthalmology
    • Medical Imaging
    • Biomedical Engineering

    Background:

    • Optical coherence tomography angiography (OCTA) is a revolutionary noninvasive imaging technique.
    • It enables detailed visualization of ocular vasculature, including capillaries.
    • Advancements in OCT speed and algorithms have made OCTA clinically accessible.

    Purpose of the Study:

    • To review the historical development of OCTA.
    • To survey the significant clinical applications of OCTA in ophthalmology.
    • To discuss challenges in OCTA interpretation and analysis, and highlight recent progress.

    Main Methods:

    • Literature review of OCTA development and clinical studies.
    • Analysis of current challenges and recent technological advancements in OCTA.
    • Synthesis of information on OCTA's utility in ophthalmological practice.

    Main Results:

    • OCTA technology has rapidly advanced, enabling detailed imaging of ocular circulation.
    • Clinical investigations using OCTA have surged, demonstrating its growing importance.
    • Key clinical applications and challenges in OCTA interpretation are identified.

    Conclusions:

    • OCTA is a valuable tool for ophthalmologists, offering unprecedented views of ocular vasculature.
    • Continued research and technological improvements are addressing current limitations.
    • OCTA is poised to further transform the diagnosis and management of eye diseases.