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International Journal of Computer Assisted Radiology and Surgery

Erschienen in:

01.03.2015 | Original Article

Electromagnetic tracking in surgical and interventional environments: usability study

verfasst von: Elodie Lugez, Hossein Sadjadi, David R. Pichora, Randy E. Ellis, Selim G. Akl, Gabor Fichtinger

Erschienen in: International Journal of Computer Assisted Radiology and Surgery | Ausgabe 3/2015

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Abstract

Purpose

Electromagnetic (EM) tracking of instruments within a clinical setting is notorious for fluctuating measurement performance. Position location measurement uncertainty of an EM system was characterized in various environments, including control, clinical, cone beam computed tomography (CBCT), and CT scanner environments. Static and dynamic effects of CBCT and CT scanning on EM tracking were evaluated.

Methods

Two guidance devices were designed to solely translate or rotate the sensor in a non-interfering fit to decouple pose-dependent tracking uncertainties. These devices were mounted on a base to allow consistent and repeatable tests when changing environments. Using this method, position and orientation measurement accuracies, precision, and 95 % confidence intervals were assessed.

Results

The tracking performance varied significantly as a function of the environment—especially within the CBCT and CT scanners—and sensor pose. In fact, at a fixed sensor position in the clinical environment, the measurement error varied from 0.2 to 2.2 mm depending on sensor orientations. Improved accuracies were observed along the vertical axis of the field generator. Calibration of the measurements improved tracking performance in the CT environment by 50–85 %.

Conclusion

EM tracking can provide effective assistance to surgeons or interventional radiologists during procedures performed in a clinical or CBCT environment. Applications in the CT scanner demand precalibration to provide acceptable performance.

Vorheriger Artikel A touch panel surgical navigation system with automatic depth perception

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Titel: Electromagnetic tracking in surgical and interventional environments: usability study
verfasst von: Elodie Lugez
Hossein Sadjadi
David R. Pichora
Randy E. Ellis
Selim G. Akl
Gabor Fichtinger
Publikationsdatum: 01.03.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: International Journal of Computer Assisted Radiology and Surgery / Ausgabe 3/2015
Print ISSN: 1861-6410
Elektronische ISSN: 1861-6429
DOI: https://doi.org/10.1007/s11548-014-1110-0

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Abstract

Purpose

Methods

Results

Conclusion

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