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Intraoperative compensation of magnetic field distortions for fluoroscopic and electromagnetic hybrid navigation

PURPOSE: Hybrid navigation is a promising technique which combines the benefits of optical or electromagnetic tracking (EMT) and fluoroscopy imaging. Unfortunately, the fluoroscopy system is a source of metallic distortion for the EMT system. In this work, we present a new method for intraoperative...

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Autores principales: Cavaliere, Marco, Cantillon-Murphy, Pádraig
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer International Publishing 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9463348/
https://www.ncbi.nlm.nih.gov/pubmed/35599296
http://dx.doi.org/10.1007/s11548-022-02663-7
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author Cavaliere, Marco
Cantillon-Murphy, Pádraig
author_facet Cavaliere, Marco
Cantillon-Murphy, Pádraig
author_sort Cavaliere, Marco
collection PubMed
description PURPOSE: Hybrid navigation is a promising technique which combines the benefits of optical or electromagnetic tracking (EMT) and fluoroscopy imaging. Unfortunately, the fluoroscopy system is a source of metallic distortion for the EMT system. In this work, we present a new method for intraoperative calibration and real-time compensation of dynamic field distortions. The method was tested in the presence of a fluoroscopy C-arm, and sub-millimetre errors were obtained after distortion correction. METHODS: A hybrid navigation scenario was created by combining the open-source electromagnetic tracking system Anser EMT and a commercial fluoroscopy C-arm. The electromagnetic field generator was placed directly on top of the X-ray collimator, which introduced significant field distortion. Magnetic sensors were placed at known positions to capture the magnetic distortion, and virtual magnetic dipole sources were used to model the distortion magnetic field. The accuracy of the compensated EMT model was tested on a grid of test points. RESULTS: Error reduction was demonstrated from 12.01 to 0.35 mm and from 25.03 to 0.49 mm, for horizontal and vertical sensor orientations, respectively, over a volume of 16 × 16 × 6 cm. It is proposed that such sub-millimetre tracking errors meet the needs of most endoscopic navigation tasks. CONCLUSIONS: We describe a method to model a magnetic field in real time, based on redundant electromagnetic field measurements, and we apply it to compensate for the distortion introduced by a fluoroscopy C-arm. The main limitation of the approach is the requirement for a high number of sensors, with possible occlusion of the operative space. Solutions might come from miniaturisation and wireless sensing.
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spelling pubmed-94633482022-09-11 Intraoperative compensation of magnetic field distortions for fluoroscopic and electromagnetic hybrid navigation Cavaliere, Marco Cantillon-Murphy, Pádraig Int J Comput Assist Radiol Surg Short Communication PURPOSE: Hybrid navigation is a promising technique which combines the benefits of optical or electromagnetic tracking (EMT) and fluoroscopy imaging. Unfortunately, the fluoroscopy system is a source of metallic distortion for the EMT system. In this work, we present a new method for intraoperative calibration and real-time compensation of dynamic field distortions. The method was tested in the presence of a fluoroscopy C-arm, and sub-millimetre errors were obtained after distortion correction. METHODS: A hybrid navigation scenario was created by combining the open-source electromagnetic tracking system Anser EMT and a commercial fluoroscopy C-arm. The electromagnetic field generator was placed directly on top of the X-ray collimator, which introduced significant field distortion. Magnetic sensors were placed at known positions to capture the magnetic distortion, and virtual magnetic dipole sources were used to model the distortion magnetic field. The accuracy of the compensated EMT model was tested on a grid of test points. RESULTS: Error reduction was demonstrated from 12.01 to 0.35 mm and from 25.03 to 0.49 mm, for horizontal and vertical sensor orientations, respectively, over a volume of 16 × 16 × 6 cm. It is proposed that such sub-millimetre tracking errors meet the needs of most endoscopic navigation tasks. CONCLUSIONS: We describe a method to model a magnetic field in real time, based on redundant electromagnetic field measurements, and we apply it to compensate for the distortion introduced by a fluoroscopy C-arm. The main limitation of the approach is the requirement for a high number of sensors, with possible occlusion of the operative space. Solutions might come from miniaturisation and wireless sensing. Springer International Publishing 2022-05-23 2022 /pmc/articles/PMC9463348/ /pubmed/35599296 http://dx.doi.org/10.1007/s11548-022-02663-7 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Short Communication
Cavaliere, Marco
Cantillon-Murphy, Pádraig
Intraoperative compensation of magnetic field distortions for fluoroscopic and electromagnetic hybrid navigation
title Intraoperative compensation of magnetic field distortions for fluoroscopic and electromagnetic hybrid navigation
title_full Intraoperative compensation of magnetic field distortions for fluoroscopic and electromagnetic hybrid navigation
title_fullStr Intraoperative compensation of magnetic field distortions for fluoroscopic and electromagnetic hybrid navigation
title_full_unstemmed Intraoperative compensation of magnetic field distortions for fluoroscopic and electromagnetic hybrid navigation
title_short Intraoperative compensation of magnetic field distortions for fluoroscopic and electromagnetic hybrid navigation
title_sort intraoperative compensation of magnetic field distortions for fluoroscopic and electromagnetic hybrid navigation
topic Short Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9463348/
https://www.ncbi.nlm.nih.gov/pubmed/35599296
http://dx.doi.org/10.1007/s11548-022-02663-7
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