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Updated: Apr 26, 2026

Quantifying Intermembrane Distances with Serial Image Dilations
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Delineating elliptical objects with an application to cardiac scintigrams.

J A Blokland, A M Vossepoel, A R Bakker

    IEEE Transactions on Medical Imaging
    |January 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a Hough transform-based method for delineating the left ventricle myocardium in thallium-201 scintigrams. The algorithm accurately detects cardiac contours, even with partial visualization, improving diagnostic capabilities for ischemic heart disease.

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    Area of Science:

    • Medical Imaging
    • Image Analysis
    • Cardiology

    Background:

    • Accurate delineation of the left ventricle myocardium is crucial for diagnosing cardiac conditions.
    • Planar thallium-201 scintigraphy is a common imaging technique for assessing myocardial perfusion.
    • Existing methods may struggle with partially visualized contours in scintigrams.

    Purpose of the Study:

    • To develop and present a novel method for delineating the myocardium in planar thallium-201 scintigrams.
    • To improve the accuracy and robustness of left ventricle contour detection.
    • To enable detection of cardiac contours even when they are only partially visualized.

    Main Methods:

    • Utilizes the Hough transformation to map feature points into the parameter space of ellipse axis lengths.
    • Extends the 2-D probability density function (pdf) to a 5-D pdf for unknown ellipse parameters (center, orientation, axis lengths).
    • Applies local search algorithms to find the maximum likelihood estimate of ellipse parameters, considering variance and likelihood.

    Main Results:

    • The proposed method effectively delineates the myocardium in thallium-201 scintigrams.
    • Demonstrates the ability to detect contours even with partial visualization, relevant for ischemic heart disease.
    • Shows that estimation variance increases with errors in ellipse center location and orientation.

    Conclusions:

    • The Hough transform-based method provides a robust approach for left ventricle myocardium delineation.
    • The algorithm is suitable for analyzing partially visualized contours in cardiac scintigraphy.
    • The method's adaptability extends to various curved contours with a low number of parameters.