Hardware Requirements for 2D Cylindrical-High Pass Ladder Coil Design enabling Homogeneous Excitation in Ultra High-Field MRI

This paper discusses the hardware architecture of a volumetric 2D c-HPL radio frequency MRI coil. Five prototypes using different inductor-capacitor (LC) resonator combinations are constructed. The experimentally obtained eigenfrequencies are compared with those obtained theoretically from the dispersion equation. The transverse and longitudinal coupling coefficients are approximately 6% and 9%, respectively. An individual element consisting of 12 pF capacitors at each end and a simple tunable non-magnetic variable capacitor resulted in a single-element resonance frequency. $f$ , of 286 MHz. For a $4\ \mathrm{x}\ 6$ array with this individual resonance, the experimentally obtained, coupled, eigenfrequencies were measured as 274.17 MHz, 276.98 MHz, 280.2 MHz, 283.82 MHz, 286.63 MHz, 296.68 MHz (imaging mode), and 305 MHz, which is in good agreement with the dispersion equation.