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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

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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

Imaging Biological Samples with Optical Microscopy

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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.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
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Imaging Studies I: CT and MRI01:14

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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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...
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Imaging Studies for Cardiovascular System V: CT01:28

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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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Updated: Dec 25, 2025

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

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Optically computed optical coherence tomography for volumetric imaging.

Yahui Wang, Qi Kang, Yuanwei Zhang

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    |April 3, 2020
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    Summary
    This summary is machine-generated.

    We developed a new optical coherence tomography (OCT) system that uses optical computation for faster imaging. This technology achieves volumetric OCT imaging without mechanical scanning or computer-based Fourier transforms.

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    Area of Science:

    • Biomedical Optics
    • Optical Imaging
    • Signal Processing

    Background:

    • Optical Coherence Tomography (OCT) is a crucial imaging modality for visualizing subsurface structures.
    • Traditional OCT systems often rely on mechanical scanning and computationally intensive Fourier transforms for image reconstruction.
    • These limitations can hinder real-time and high-speed volumetric imaging applications.

    Purpose of the Study:

    • To introduce and demonstrate an innovative optically computed optical coherence tomography (OC-OCT) technology.
    • To enable volumetric OCT imaging without mechanical scanning or traditional computer-based Fourier transforms.
    • To advance the speed and efficiency of OCT imaging.

    Main Methods:

    • The OC-OCT system performs depth-resolved imaging by optically computing the Fourier transform of interferometric spectra.
    • Interferometric spectra are modulated using Fourier basis functions projected onto a spatial light modulator.
    • The modulated signal is detected directly, eliminating the need for spectral discrimination and computer processing.

    Main Results:

    • Demonstrated a novel optical computation strategy for OCT.
    • Achieved volumetric OCT imaging capabilities.
    • Eliminated the requirement for mechanical scanning and computer-based Fourier transforms.

    Conclusions:

    • The developed OC-OCT technology offers a significant advancement in OCT imaging.
    • This approach enables faster and more efficient volumetric imaging.
    • The optical computation method presents a promising alternative for future OCT system designs.