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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 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...
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...

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Related Experiment Video

Updated: Jun 22, 2026

In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography
07:44

In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography

Published on: July 24, 2020

Adaptive ranging for optical coherence tomography.

N Iftimia, B Bouma, J de Boer

    Optics Express
    |June 2, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Adaptive optical coherence tomography improves imaging depth for better diagnosis. This technique enhances sensitivity by matching imaging depth to tissue penetration, overcoming limitations of conventional systems.

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    Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
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    Area of Science:

    • Biomedical Optics
    • Medical Imaging Technology

    Background:

    • Conventional optical coherence tomography (OCT) systems possess limited imaging depth, hindering the diagnosis of large vessels and hollow organs.
    • Adaptive ranging is a crucial feedback technique that optimizes imaging depth by adjusting the coherence gate offset and range based on image data.

    Purpose of the Study:

    • To demonstrate an adaptive optical coherence tomography (OCT) system with an expanded 7.0 mm imaging range.
    • To improve diagnostic capabilities for structures previously limited by conventional OCT depth penetration.

    Main Methods:

    • Implementation of an adaptive ranging feedback mechanism within the OCT system.
    • System calibration to match the imaging depth to the approximate 1.5 mm tissue penetration depth.

    Main Results:

    • Achieved a 7.0 mm imaging range, significantly exceeding conventional system ranges.
    • Demonstrated a 3 dB sensitivity improvement compared to conventional OCT systems with a 3.0 mm imaging depth.
    • Successfully matched imaging depth to optimize penetration in biological tissues.

    Conclusions:

    • The developed adaptive OCT system overcomes depth limitations of conventional OCT.
    • Enhanced sensitivity and extended range improve diagnostic potential for deep tissue imaging.
    • Adaptive ranging is a viable technique for advancing OCT capabilities in medical diagnostics.