Current motion tracking modalities operate either in frequency bands that are also occupied by the MRI scanner or interact heavily with the environment. As an alternative, the frequency band of 1-5 MHz can be utilized for motion tracking and has been demonstrated to deliver high performance. Due to the limited sensitivity at a great distance of current broadband systems, we show in this work how short-wave motion tracking can be done at long ranges, enabling independent and robust motion tracking with fewer geometric constraints and greater ease of use.
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