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Abstract #3300

Techniques in Low-IF, Low Power MRI Front Ends

Alice Fontaine1, Fraser Robb2, Shreyas Vasanawala3, John Pauly1, and Greig Scott4
1Stanford University, Stanford, CA, United States, 2GE Healthcare, Aurora, OH, United States, 3Radiology, Stanford University, Stanford, CA, United States, 4Electrical Engineering, Stanford University, Stanford, CA, United States

Synopsis

Keywords: Hybrid & Novel Systems Technology, Hybrid & Novel Systems Technology, Low Power Electronics

Motivation: Wearable MRI receive arrays are hindered by bulky cabling, and cable traps to support off-coil signal/data transfer. This impacts patient workflow and handling.

Goal(s): Our goal is to identify low power techniques for balun-free receive chains that could potentially be located on the array.

Approach: We have prototyped image reject low power mixers, PCB planar transformers, and low intermediate frequency active op-amp anti-aliasing filter topologies for use with a SAR ADC.

Results: Fully differential op-amp antialiasing filters achieve under 30mW power, and perform >500kHz bandpass anti-aliasing at 1.25 MHz low-IF. Image rejection exceeds 40dB for only 14-18mW. Distributed on-coil signal chains are feasible.

Impact: If the front end electronics can be distributed on the coil array, this opens the possibility of data transmission with a wireless interface. The receive topology could eliminate cable trap baluns, which inhibit flexibility and wearability, compromising form factor.

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