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Abstract #0739

A Method for a Wireless Marker Using a Monopole Antenna for Endovascular Catheter Navigation

Caroline D. Jordan1, Steven W. Hetts1, and Xiaoliang Zhang1

1Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, United States

Inductively coupled RF coils have been used as markers for MR guidance of endovascular catheters using lumped elements, and a monopole antenna could be used as a marker that is more compact and easy to build. We built three prototypes for 3T, acquired GRE sequences and B1+ maps in two orientations, and modeled electromagnetic fields using low and high permittivity dielectric coating on the monopole. Measured Q-factors were 7.6–11.7, scaled experimental B1+ of marker signal were 198–272%, and modeled electric fields were reduced. This work demonstrates feasibility of a monopole antenna as a wireless marker for interventional MRI.

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