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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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