The “Loopole” Antenna: A Hybrid Coil Combining Loop and Electric Dipole Properties for Ultra-High-Field MRI

Figure 4

Single-element maps produced by loop, loopole, and electric dipole in simulations. The loop produces an asymmetric distribution with a strong null, whereas the electric dipole produces a nearly symmetric . The loopole exhibits, instead, a hybrid behavior with the focused near the high current arm and with a weak null.