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Related Concept Videos

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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Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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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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Related Experiment Video

Updated: May 3, 2026

Optical Coherence Tomography: Imaging Mouse Retinal Ganglion Cells In Vivo
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Retinal neurovascular coupling evaluation with circular-scan OCTA.

Naixing Huang, Tristan T Hormel, Siyu Chen

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    Summary
    This summary is machine-generated.

    This study introduces a new functional optical coherence tomography angiography (fOCTA) system to visualize neurovascular coupling (NVC) in the retina. The advanced prototype enables early detection of retinal dysfunction by capturing light-evoked hemodynamic responses.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Biomedical Engineering

    Background:

    • Neurovascular coupling (NVC) links neuronal activity to retinal blood flow.
    • Abnormalities in NVC may indicate early retinal dysfunction.
    • Conventional optical coherence tomography angiography (OCTA) cannot detect light-evoked hemodynamic responses crucial for NVC assessment.

    Purpose of the Study:

    • To develop and validate a functional OCTA prototype for visualizing and quantifying NVC in the human retina.
    • To overcome limitations of motion artifacts and temporal resolution in existing OCTA technology.
    • To demonstrate the potential of the new system for clinical translation and early diagnosis of retinal diseases.

    Main Methods:

    • Developed a functional OCTA prototype using off-the-shelf optics and a 200-kHz A-line rate laser.
    • Integrated a green light stimulus to reliably trigger NVC.
    • Employed a circular-scan pattern to enhance temporal resolution and minimize motion artifacts for in vivo assessment.

    Main Results:

    • Successfully visualized and quantified NVC-driven hemodynamics in healthy human retinas.
    • Presented NVC response curves and statistical analyses across multiple vascular plexuses.
    • Demonstrated the system's capability to capture light-evoked hemodynamic responses.

    Conclusions:

    • The developed functional OCTA prototype effectively overcomes previous technological limitations for NVC assessment.
    • The system shows significant potential for advancing the early diagnosis of retinal diseases.
    • This technology could pave the way for improved clinical monitoring of retinal health.