Ultrasonic MRI has been demonstrated successful for dedicated short head gradients running with slew rates over 5000T/m/s without experiencing painful peripheral nerve stimulation. However, this requires insert coils with complex cooling and high power connecters that limit its ease of use. More elegant would be to translate the technology to body gradients, yet operation of use will come to audible frequencies when avoiding PNS. Here we show a 20kHz setup that uses a 5 lobe polynomial rather than linear gradient in Z-direction combined with high channel SENSE unfolding that can reduce PNS 5-fold so to maintain ultrasonic.
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