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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Magn Reson Med. 2018 Apr 22;80(5):2256–2266. doi: 10.1002/mrm.27207

Figure 1.

Figure 1

A time snapshot of the ideal current patterns associated with the UISNR at the center of a sphere, for B0 = 1.5 T, 3 T, 7 T, and 11 T. The ideal current patterns form two large distributed loops, centered on the x–y plane (θ = 90°) and separated by 180 degrees in the azimuthal direction, which rotate in the same sense about an axis that precesses around the direction of the main magnetic field (z). Ideal currents are the same in all cases, except for a phase shift, which is clearly visible in the 2D “unwrapped” view of the spherical surface (bottom row).