Figure 2.

Broadband self-grounded bow-tie (SGBT) antenna and H-field distributions in the human voxel model Duke. (a) Front and side view of a SGBT antenna in the uvw-coordinate system. H-field distributions are shown for the head of the human voxel model Duke using an xyz-coordinate system for (b) H-field induced by a SGBT antenna (specified by a red border) with the long axis being aligned along the superior-inferior direction (y-axis) of the head; (c,d) H-field induced by a SGBT antenna placed on top of the head with the long axis being aligned along the y (c) or the x-direction (d) of the head model. (e) Dark MRI mode H-field induced by a SGBT antenna placed perpendicular to B₀ with the long axis aligned along the x-direction of the head model. The static magnetic field B₀ is in the z-direction. Schematic views of the ThermalMR applicators using a (f) helmet and (g) annular array comprising ten SGBT building blocks.