Plots comparing NMRSE for alterations in the shielding model are shown. NMRSE data versus field location are plotted for five different shields. Shield A (solid line with circles), B (dashed line), and C (dotted line) are continuous copper cylinders of a single layer with a thickness of 76.2 µm, 50.8 µm, and 25.4 µm (0.003”, 0.002”, and 0.001”) respectively. Shield D (solid line with triangles) is 50.8 µm (0.002”) thick with axial gaps. Shield E (dash-dotted line) has two 25.4 µm (0.001”) layers such that the outer one has axial gaps and the inner one is solid. Diagrams of shields D and E are shown unwrapped in (b).