Quadrature wireless coil for 1.5 T MRI of the wrist

In this work, we demonstrate a transceive quadrature volumetric wireless coil improving the visualization of the wrist cartilage in 1.5 T magnetic resonance (MR) systems. Due to the electromagnetic coupling with the transceive body coil of an MR scanner, the wireless coil focuses the radiofrequency (RF) magnetic field of the body coil in the area of interest. We show numerically and experimentally that the proposed coil design is 1.7 times more effective in terms of transmit efficiency in comparison with the linear polarized wireless analogs. Moreover, the quadrature coil has a receive performance comparable of that of a local transceive extremity coil with cable connection to the MR scanner.