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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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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.
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Computed Tomography (CT) scan:
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Related Experiment Video

Updated: Mar 27, 2026

Meta-analysis of Voxel-Based Neuroimaging Studies using Seed-based d Mapping with Permutation of Subject Images SDM-PSI
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Testing the effects of pre-processing on voxel based morphometry analysis.

C V Chaitanya, N Koirala, K G Mideksa

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 7, 2016
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    Summary
    This summary is machine-generated.

    This study investigated how preprocessing steps affect longitudinal brain imaging analysis in blepharospasm (BFS) patients. Optimized methods revealed significant grey matter changes after botulinum toxin treatment.

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    Area of Science:

    • Neuroimaging
    • Neurology
    • Medical Image Analysis

    Background:

    • Voxel-based morphometry (VBM) enables voxel-wise comparisons of grey matter volumes between MRIs.
    • VBM supports both cross-sectional and longitudinal analyses to detect regional brain changes.
    • Blepharospasm (BFS) is often treated with botulinum toxin injections.

    Purpose of the Study:

    • To evaluate the impact of normalization and smoothing preprocessing steps on longitudinal VBM analysis in BFS patients.
    • To analyze structural grey matter differences in BFS patients before and after botulinum toxin treatment.

    Main Methods:

    • Longitudinal Voxel-Based Morphometry (VBM) analysis of brain MRIs.
    • Comparison of grey matter volumes at two time points: pre- and post-treatment.
    • Investigation of different normalization (e.g., DARTEL) and smoothing parameters.

    Main Results:

    • The DARTEL normalization technique combined with lower smoothing width yielded pathophysiologically plausible results.
    • Longitudinal analysis identified significant temporal grey matter changes following botulinum toxin treatment in BFS patients.

    Conclusions:

    • Optimized preprocessing steps are crucial for reliable longitudinal VBM studies.
    • Botulinum toxin treatment induces significant structural brain changes in patients with blepharospasm.