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High-precision evaluation of electromagnetic tracking

Kügler, David and Krumb, Henry and Bredemann, Judith and Stenin, Igor and Kristin, Julia and Klenzner, Thomas and Schipper, Jörg and Schmitt, Robert and Sakas, Georgios and Mukhopadhyay, Anirban (2019):
High-precision evaluation of electromagnetic tracking.
In: International Journal of Computer Assisted Radiology and Surgery, ISSN 1861-6410,
DOI: 10.1007/s11548-019-01959-5,
[Online-Edition: https://doi.org/10.1007/s11548-019-01959-5],
[Article]

Abstract

Purpose

Navigation in high-precision minimally invasive surgery (HP-MIS) demands high tracking accuracy in the absence of line of sight (LOS). Currently, no tracking technology can satisfy this requirement. Electromagnetic tracking (EMT) is the best tracking paradigm in the absence of LOS despite limited accuracy and robustness. Novel evaluation protocols are needed to ensure high-precision and robust EMT for navigation in HP-MIS.

Methods

We introduce a novel protocol for EMT measurement evaluation featuring a high-accuracy phantom based on LEGO®, which is calibrated by a coordinate measuring machine to ensure accuracy. Our protocol includes relative sequential positions and an uncertainty estimation of positioning. We show effects on distortion compensation using a learned interpolation model.

Results

Our high-precision protocol clarifies properties of errors and uncertainties of EMT for high-precision use cases. For EMT errors reaching clinically relevant 0.2 mm, our design is 5–10 times more accurate than previous protocols with 95% confidence margins of 0.02 mm. This high-precision protocol ensures the performance improvement in compensated EMT by 0.05 mm.

Conclusion

Our protocol improves the reliability of EMT evaluations because of significantly lower protocol-inherent uncertainties. To reduce patient risk in HP-MIS and to evaluate magnetic field distortion compensation, more high-accuracy protocols such as the one proposed here are required.

Item Type: Article
Erschienen: 2019
Creators: Kügler, David and Krumb, Henry and Bredemann, Judith and Stenin, Igor and Kristin, Julia and Klenzner, Thomas and Schipper, Jörg and Schmitt, Robert and Sakas, Georgios and Mukhopadhyay, Anirban
Title: High-precision evaluation of electromagnetic tracking
Language: English
Abstract:

Purpose

Navigation in high-precision minimally invasive surgery (HP-MIS) demands high tracking accuracy in the absence of line of sight (LOS). Currently, no tracking technology can satisfy this requirement. Electromagnetic tracking (EMT) is the best tracking paradigm in the absence of LOS despite limited accuracy and robustness. Novel evaluation protocols are needed to ensure high-precision and robust EMT for navigation in HP-MIS.

Methods

We introduce a novel protocol for EMT measurement evaluation featuring a high-accuracy phantom based on LEGO®, which is calibrated by a coordinate measuring machine to ensure accuracy. Our protocol includes relative sequential positions and an uncertainty estimation of positioning. We show effects on distortion compensation using a learned interpolation model.

Results

Our high-precision protocol clarifies properties of errors and uncertainties of EMT for high-precision use cases. For EMT errors reaching clinically relevant 0.2 mm, our design is 5–10 times more accurate than previous protocols with 95% confidence margins of 0.02 mm. This high-precision protocol ensures the performance improvement in compensated EMT by 0.05 mm.

Conclusion

Our protocol improves the reliability of EMT evaluations because of significantly lower protocol-inherent uncertainties. To reduce patient risk in HP-MIS and to evaluate magnetic field distortion compensation, more high-accuracy protocols such as the one proposed here are required.

Journal or Publication Title: International Journal of Computer Assisted Radiology and Surgery
Uncontrolled Keywords: Electromagnetic tracking, High-precision surgery, Metallic distortion compensation, Evaluation protocol, LEGO®phantom
Divisions: 20 Department of Computer Science
20 Department of Computer Science > Interactive Graphics Systems
Date Deposited: 03 May 2019 05:28
DOI: 10.1007/s11548-019-01959-5
Official URL: https://doi.org/10.1007/s11548-019-01959-5
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