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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