High Precision Tracking of Un-Tuned Micro-Coils for Real-Time Motion Correction Applications

Melvyn B. Ooi¹, Murat Aksoy¹, Ronald D. Watkins¹, Roland Bammer¹

The ability to track the positions of multiple micro RF-coil “active markers” in the MRI scanner has been the foundation of several recent advances in MR-guided intervention, as well as motion correction applications. The current work demonstrates that un-tuned markers, while simplifying coil design and reducing unwanted RF-related effects, provide sufficient signal for accurate/precise position tracking measurements in a temporal resolution suitable for use in real-time applications. A series of position measurements using un-tuned and tuned markers are performed on a well-defined grid-phantom for comparison.