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Medical Physics / Volume 39 / Issue 1 / RADIATION IMAGING PHYSICS

Med. Phys. 39, 399 (2012); http://dx.doi.org/10.1118/1.3666768 (8 pages)

Accuracy of electromagnetic tracking with a prototype field generator in an interventional OR setting

Lars Eirik Bø

Department of Medical Technology, SINTEF Technology and Society, Trondheim, Norway and Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology (NTNU), Trondheim, Norway

Håkon Olav Leira and Tore Amundsen

Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology (NTNU), Trondheim, Norway and Department of Thoracic Medicine, St. Olavs Hospital, Trondheim, Norway

Geir Arne Tangen, Erlend Fagertun Hofstad, and Thomas Langø

Department of Medical Technology, SINTEF Technology and Society, Trondheim, Norway

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(Received 19 August 2011; accepted 11 November 2011; revised 20 October 2011; published online 23 December 2011)

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Purpose: The authors have studied the accuracy and robustness of a prototype electromagnetic window field generator (WFG) in an interventional radiology suite with a robotic C-arm. The overall purpose is the development of guidance systems combining real-time imaging with tracking of flexible instruments for bronchoscopy, laparoscopic ultrasound, endoluminal surgery, endovascular therapy, and spinal surgery.
Methods: The WFG has a torus shape, which facilitates x-ray imaging through its centre. The authors compared the performance of the WFG to that of a standard field generator (SFG) under the influence of the C-arm. Both accuracy and robustness measurements were performed with the C-arm in different positions and poses.
Results: The system was deemed robust for both field generators, but the accuracy was notably influenced as the C-arm was moved into the electromagnetic field. The SFG provided a smaller root-mean-square position error but was more influenced by the C-arm than the WFG. The WFG also produced smaller maximum and variance of the error.
Conclusions: Electromagnetic (EM) tracking with the new WFG during C-arm based fluoroscopy guidance seems to be a step forward, and with a correction scheme implemented it should be feasible.

© 2012 American Association of Physicists in Medicine

ACKNOWLEDGMENTS

The authors would very much like to thank Emmanuel Wilson at the Georgetown University Medical Center for providing us with the phantom and matlab code used in this work. This study was supported by: SINTEF (Trondheim, Norway), The Ministry of Health and Social Affairs of Norway, through the National Centre for 3D Ultrasound in Surgery (Trondheim, Norway), project 196726/V50 eMIT (Enhanced minimally invasive therapy, FRIMED program), and the Operating Room of the Future project at St. Olavs Hospital (Trondheim, Norway).

Article Outline

  1. INTRODUCTION
  2. MATERIALS AND METHODS
    1. Experimental setup
    2. Tracking system accuracy analysis
    3. Tracking System Robustness Analysis
  3. RESULTS
    1. Tracking system accuracy
    2. Tracking system robustness
  4. DISCUSSION
  5. CONCLUSION
Digital Object Identifier
http://dx.doi.org/10.1118/1.3666768

KEYWORDS and PACS

Keywords

diagnostic radiography, mean square error methods, radiology, surgery, image-guided therapy, electromagnetic tracking, accuracy analysis, interventional OR

PACS

PUBLICATION DATA

ISSN

0094-2405 (print)  

Publisher

$abstract.society.value is a Member of CrossRef American Association of Physicists in Medicine

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