Volume 72, Issue 1 pp. 269-275
Full Paper

A controllable susceptibility marker for passive device tracking

William Dominguez-Viqueira

Corresponding Author

William Dominguez-Viqueira

Imaging Research, Sunnybrook Research Institute, Toronto, Ontario, Canada

Correspondence to: William Dominguez-Viqueira, Ph.D., Sunnybrook Research Institute, 2075 Bayview Avenue, M-wing and room M7-410, Toronto, Ontario, Canada M4N 3M5. E-mail: [email protected]Search for more papers by this author
Hirad Karimi

Hirad Karimi

Imaging Research, Sunnybrook Research Institute, Toronto, Ontario, Canada

Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada

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Wilfred W. Lam

Wilfred W. Lam

Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK

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Charles H. Cunningham

Charles H. Cunningham

Imaging Research, Sunnybrook Research Institute, Toronto, Ontario, Canada

Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada

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First published: 06 August 2013
Citations: 8

Abstract

Purpose

To design and demonstrate a new susceptibility-based tracking device with an artifact that can be mechanically turned on and off, thus permitting tracking and imaging at the device tip with limited artifact.

Methods

The magnetic susceptibilities of readily obtainable grades of titanium and graphite were measured. Using numerical optimization, layer thicknesses for three concentric cylinders were found where the field from the graphite layer maximally cancelled the fields from titanium layers. The tracking elements were fabricated for an outer diameter of 3 mm and attached to a catheter to show feasibility of detection in phantoms and in vivo.

Results

The device was successfully integrated into a 9F catheter, and its use with conventional guidewires under fluoroscopy was demonstrated by guiding the catheter through the bifurcation into the carotid artery. MR images including the catheter tip were acquired with the device in both the “on” and “off” positions.

Conclusion

A new passive tracking device with a susceptibility effect that can be enabled and disabled by sliding one of the components was designed, fabricated, and demonstrated in phantoms and in vivo. The device may also be integrated into many different interventional MR devices such as needles, ultrasound transducers for prostate biopsy, or any catheter-based devices. Magn Reson Med 72:269–275, 2014. © 2013 Wiley Periodicals, Inc.

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