Fig 2. Field distribution.

For assessment of the field homogeneity over the spherical workspace with a diameter of 20 cm, a simple linear field calculation was performed for a desired field amplitude of 10 mT/μ₀. (a) Overview of field configuration in central xy plane for field aligned in the plane. The workspace is indicated by the gray circle. (b) Positions and labels of individual coil stacks. (c) Snapshot of field configuration for field rotation in the xy plane. The field strength and orientation is plotted for the central xy (left) and xz plane (right), respectively. The full rotation sequence can be found in S1 video. (d) Snapshot for field rotation in the xz plane. The full rotation sequence can be found in S2 video.