Declining costs of permanent magnets and embedded systems electronics has driven systems engineering of point-of-care diagnostics to the forefront of MR research. We present a low-cost RF signal chain (<$100) for low-field imaging using a Teensy 4.0 microcontroller and STHV800 ultrasound pulser IC. Bloch-optimization simulation of programmable, dithered-pulses enables broadband excitation of the notably inhomogeneous permanent magnets employed in portable, hand-held MR systems.
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