Tracking a 6F catheter under MRI using a controllable susceptibility device: a new tracking mechanism.
William Dominguez-Viqueira 1 , Chris Dey 2 , Hirad Karimi 1,3 , Jennifer Barry 1 , and Charles H Cunningham 1,3
Physical Sciences, Sunnybrook Research
Institute, Toronto, Ontario, Canada,
Imaging, Sunnybrook Health Sciences Centre, Toronto,
Biophysics, University of Toronto, Toronto, Ontario,
Recently a novel susceptibility-based tracking device
which can be mechanically turned ON and OFF was
demonstrated for MR guided interventions. For this work,
a new two-layer tracking element was designed,
integrated into a 6F catheter with a lumen and
demonstrated in-vivo. A novel tracking method was
demonstrated in which the graphite layer was
periodically moved every TR, creating a ghost of the
catheter tip at precisely FOV/2 from the true location
in projection images. In future work, an automated
actuator will be designed and constructed to permit
toggling of the device during rapid, short-TR projection
images, enabling quick snap-to-slice functionality.
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