Pilot Tone (PT) navigators are tones within the MR receiver bandwidth that are used to estimate subject motion. Unfortunately, PTs are bound to the Larmor frequency with a wavelength of 1-4.7m (7T to 1.5T), limiting their sensitivity to motion. We propose a new approach, Beat Pilot Tone (BPT), which overcomes this limitation using second order intermodulation in MR coil preamplifiers (preamps). Any two tones separated by the desired PT frequency are mixed at the preamp and digitized by the receiver. We demonstrate our approach at 2.4GHz, obtaining improved sensitivity (20x) compared to PT without reduction of image SNR.
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