Abstract #4159
Modulation of Magnetic Susceptibility Markers with Laser-induced Demagnetization of Nickel Nanoparticles
Hirad Karimi 1,2 , William Dominguez-Viqueira 2 , and Charles H Cunningham 1,2
1
Medical Biophysics, University of Toronto,
Toronto, Ontario, Canada,
2
Imaging
Research, Sunnybrook Health Sciences Centre, Toronto,
Ontario, Canada
Performing catheter and needle-based interventional
procedures under MRI guidance remains a promising area,
where the extra soft tissue contrast can be used to
improve outcomes in certain procedures. Passive tracking
with susceptibility effects offers an easy-to-make and
cost efficient method for tracking interventional
devices, however difficulty locating devices when they
are out-of-slice, or in projection images, is a major
drawback. Laser-induced demagnetization of metal films
has been used in magneto-optic devices. In this
abstract, the possibility of using laser-induced
demagnetization to modulate the susceptibility artifact
from Ni nanoparticles in MR-images was investigated,
making the artifact “flicker” and enabling detection
in projection images.
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