Radially Extended 3D Birdcage Antenna for MRI With Loop-Type Legs and Connection to the Shield

A novel radially extended 3D birdcage (BC) coil antenna was designed, simulated, and optimized for a cylindrical dielectric phantom at 4.7 T. The consists of classical with additional protrusions toward the inside connections to shield. To overcome huge computational burden optimization process using particle swarm (PSO) method, an in-house method moment (MoM) code exploiting symmetry structure has been developed. produces open-circuit embedded element patterns makes use Schur complement analyze effects passive loads, in presence phantom. simulation results have verified commercial software. proposed BC showed 34 % improvement homogeneity B + 1 37 reduction peak specific absorption rate (SAR), compared conventional coil.