Optimization and Testing of a ¹H/³He Double-Nuclear Quadrature Transmit Coil, Applying the Analytical Method at 0.06T

Application of polarized noble gas technology in lung functional magnetic resonance imaging (fMRI) has garnered attention for its unique advantages, such as high resolution and a lack of radiation exposure. This paper presents a 4-channel radio frequency (RF) coil design method for applications of an ¹H/³He MRI system at the ultra-low field of 0.06T. For the complex model of the double-nuclear ¹H/³He coil, the analytical optimization method (based on the theories of Biot-Savart law and PSO algorithm) and the electromagnetic (EM) field and radio frequency (RF) circuit co-simulation method was implemented to optimize the analysis, resulting in an effective evaluation. The simulation results demonstrated that the proposed model has the potential for imaging of the lung with the ¹H/³He MRI system at an ultra-low field.