A novel fully automatic system for the evaluation of electromagnetic tracker

Ingmar Gergel, Johannes Gaa, Michael Müller, Hans Peter Meinzer, Ingmar Wegner

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    7 Scopus citations

    Abstract

    Electromagnetic tracking (EMT) systems are gaining increased attention in various fields of image-guided surgery. One of the main problems related to EMT systems is their vulnerability to distortion due to metallic objects. Several methods have been introduced to evaluate electromagnetic trackers, yet, the data acquisition has to be manually performed in a time consuming procedure, which often leads to a sparse volume coverage. The aim of this work is to present a fully automatic calibration system. It consists of a novel, parallel robotic arm and has the potential to collect a very large number of tracking data while scanning the entire tracking volume of a field generator. To prove the feasibility of our system, we evaluate two electromagnetic field generators (NDI Planar and Tabletop) in an ideal metal-free environment and in a clinical setup. Our proposed calibration robot successfully performed throughout the experiments and examined 1,000 positions in the tracking volume of each field generator (FG). According to the results both FGs are highly accurate in an ideal environment. However, in the examined clinical setup, the Planar FG is strongly distorted by metallic objects. Whereas the Tabletop FG provided very robust and accurate tracking, even if metallic objects where lying directly underneath the FG.

    Original languageEnglish (US)
    Title of host publicationMedical Imaging 2012
    Subtitle of host publicationImage-Guided Procedures, Robotic Interventions, and Modeling
    DOIs
    StatePublished - May 1 2012
    EventMedical Imaging 2012: Image-Guided Procedures, Robotic Interventions, and Modeling - San Diego, CA, United States
    Duration: Feb 5 2012Feb 7 2012

    Publication series

    NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
    Volume8316
    ISSN (Print)1605-7422

    Other

    OtherMedical Imaging 2012: Image-Guided Procedures, Robotic Interventions, and Modeling
    CountryUnited States
    CitySan Diego, CA
    Period2/5/122/7/12

    Keywords

    • Electromagnetic tracking
    • calibration
    • data acquisition
    • positioning robot

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Biomaterials
    • Atomic and Molecular Physics, and Optics
    • Radiology Nuclear Medicine and imaging

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  • Cite this

    Gergel, I., Gaa, J., Müller, M., Meinzer, H. P., & Wegner, I. (2012). A novel fully automatic system for the evaluation of electromagnetic tracker. In Medical Imaging 2012: Image-Guided Procedures, Robotic Interventions, and Modeling [831608] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 8316). https://doi.org/10.1117/12.911387