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Abstract #4399

Microwave Pilot Tone: Coil Array with Integrated RF Mixing for Efficient Motion Sensing

Naz Khairallah1, Julian Maravilla1, Suma Anand1, Ana Claudia Arias1, and Michael Lustig 1
1EECS, University of California, Berkeley, Berkeley, CA, United States

Synopsis

Keywords: New Devices, New Devices, RF, Motion-Sensing

Motivation: To develop a more efficient, sensitive and integrated solution to current motion sensing techniques.

Goal(s): Demonstrate a mixer-on-coil approach to motion sensing that allows for freedom in choice of RF frequency without relying on the scanner's hardware.

Approach: We incorporate mixers onto receivers coils to efficiently mix down motion modulated high frequency signals into a tone that lies within the receiver’s bandwidth and compare its performance to Pilot Tone (PT).

Results: In cardiac and respiratory motion sensing, µPT demonstrates a x3-4 increase in percent modulation when compared to PT, aligning closely with PPG and bellow recordings with minimal impact on the noise floor.

Impact: µPT would enable efficient, higher sensitivity to motion at arbitrary frequencies, by leveraging on-coil mixing and minimizing cabling.

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