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Reconstruction of stomach geometry using magnetic source localization.

Chad E Eichler, Leo K Cheng, Niranchan Paskaranandavadivel

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 11, 2021
    PubMed
    Summary

    Magnetic source localization accurately reconstructs 3D stomach geometry, aiding diagnosis of gastric motility disorders. This non-invasive technique improves upon electrogastrogram and magnetogastrogram methods for assessing stomach function.

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    Area of Science:

    • Biomedical Engineering
    • Medical Imaging
    • Gastroenterology

    Background:

    • Gastric motility disorders pose diagnostic challenges in clinical practice.
    • Electrogastrogram (EGG) and magnetogastrogram (MGG) assess gastric slow wave (SW) dysrhythmias but lack standardized detection methods.
    • Incorporating subject-specific anatomy can improve the relationship between SWs and far-field measurements.

    Purpose of the Study:

    • To demonstrate the feasibility of using magnetic source localization to reconstruct an anatomically realistic 3D stomach model.
    • To assess the accuracy of magnetic source localization in reconstructing stomach geometry.

    Main Methods:

    • Magnetic fields from a sequentially positioned neodymium magnet were recorded using a magnetometer array.
    • Magnetic dipole approximation and particle swarm optimization were employed to estimate magnet position and orientation.
    • Reconstructed stomach geometry was evaluated using Hausdorff Distance and Average Hausdorff Distance metrics against ground-truth models.

    Main Results:

    • Median position and orientation errors of 3.8 mm and 7.3° were achieved during magnetic source localization.
    • The reconstructed 3D stomach model showed a Hausdorff Distance of 11.6 mm and Average Hausdorff Distance of 2.4 mm.
    • The results confirm the capability of source localization to accurately reconstruct stomach geometry.

    Conclusions:

    • Magnetic source localization is a viable technique for reconstructing patient-specific 3D stomach geometry.
    • This method holds potential for improving the diagnosis and understanding of gastric motility disorders.
    • Accurate anatomical reconstruction can enhance the interpretation of non-invasive gastric function assessments like EGG and MGG.