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Abstract #3428

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

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

1Department of Radiology, Stanford University, Stanford, CA, United States

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.

Keywords

accuracy accurate active advances aligned amplified applications approximate arrow averaging axes behavior beyond blocking brain caliper capacitors chosen circuit circuitry coil coils column comparable compensation concerns connects containing corrected correction critical decrease decreased described design designs despite diameter digital distances distributions dominated doped duration edges effective error evaluate evenly example experiment field fold frequency front full glass glover gradient gradients greater grid guided head histogram identical impractical inductor inhomogeneities interface intervention isolate linearity local made magnetization magnitude marker markers matched measured micro mitigate motion moved negative option orientation part peak phantom physically plots poor position positions positive precision previous projected projection pulse readout readouts real received reduce repeated representation resolution resonant respectively scale scanner secured selective several shaded significantly simplify since smaller solenoid solenoids source space spaced sphere spheres spoiler stages studies sufficient suggesting surrounding technology thank thereby track tracked tracking transform transmission tuned twice undesirable uniquely unpredictable utility visible volumes