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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.
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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.
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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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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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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.
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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Evaluation of Capillary and Other Vessel Contribution to Macular Perfusion Density Measured with Optical Coherence Tomography Angiography
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Optical Coherence Tomography Angiography: Are There Any Changes in Measurements After Strabismus Surgery?

Asli Inal, Ihsan Yilmaz, Osman Bulut Ocak

    Journal of Pediatric Ophthalmology and Strabismus
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    Strabismus surgery may alter retinal hemodynamics, increasing foveal vessel density and decreasing the foveal avascular zone. Optical coherence tomography angiography confirms these changes post-procedure.

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    Area of Science:

    • Ophthalmology
    • Retinal Imaging
    • Vascular Biology

    Background:

    • Strabismus surgery aims to correct eye alignment.
    • Hemodynamic changes in the retina following strabismus surgery are not fully understood.
    • Optical coherence tomography angiography (OCTA) offers a non-invasive method to assess retinal vasculature.

    Purpose of the Study:

    • To investigate potential hemodynamic alterations in the retina after strabismus surgery.
    • To evaluate changes in foveal avascular zones and capillary plexus vessel density using OCTA.

    Main Methods:

    • A study involving 16 patients (32 eyes) who underwent strabismus surgery.
    • Fellow eyes served as a control group.
    • OCTA was used to measure superficial and deep capillary plexus vessel densities and foveal avascular zones preoperatively and 3 months postoperatively.

    Main Results:

    • Post-strabismus surgery, a statistically significant increase in superficial and deep capillary plexus vessel density was observed (P < .05).
    • A significant decrease in both superficial and deep foveal avascular zones was noted postoperatively (P < .05).
    • No significant changes were found in the control fellow eyes (P > .05).

    Conclusions:

    • Strabismus surgery appears to influence retinal hemodynamics.
    • OCTA measurements suggest an increase in foveal vessel density and a reduction in the foveal avascular zone after strabismus surgery.
    • These findings highlight potential vascular adaptations following strabismus correction.