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Abstract #4153

Exploring the feasibility of the coherent half-FOV replication passive tracking technique for controllable susceptibility devices in the presence of motion

Justin Y.C. Lau 1,2 , Jennifer Barry 2 , and William Dominguez-Viqueira 2

1 Medical Biophysics, University of Toronto, Toronto, Ontario, Canada, 2 Physical Sciences, Sunnybrook Research Institute, Toronto, Ontario, Canada

The feasibility of locating a controllable device, with susceptibility effects that can be turned ON and OFF, in the presence of motion is examined in the common iliac artery of a porcine model. A 2D fast spoiled gradient echo sequence was modified with a phase-encoding scheme that acquires odd k-space lines first, followed by a pause to allow manual toggling of the susceptibility effect before the acquisition of even k-space lines. Despite severe motion artifacts, the device was located unambiguously in vivo. Further optimization of the sequence allowed in vitro location of both the device and a clinical balloon catheter in less than 5 seconds.

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