As recently demonstrated by Cooley et al., for Halbach-array based permanent-magnet MR imagers, time-varying encoding fields can be generated mechanically, by rotating the entire array. In this paper we show that in spokes-and-hub based permanent magnet imagers, time-varying encoding fields can also be generated mechanically, but with much smaller motions. In particular, we show that a quarter-degree magnet tilt, along an easily precessed axis, can produce a spatially-discriminating field gradient. We demonstrate the spatial discrimation using both simulation and measurements from our recently-presented prototype imager.
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