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