A Parallel Transceiver for Human Imaging at 9.4T
Ugurbil K, Vaughan J, DelaBarre L, Snyder C
University of Minnesota
At 9.4T, the short Larmor wavelength of RF in the human head produces an inhomogenous distribution of B1. To correct some of these variations, a parallel transceiver was designed and tested. Each element in a multichannel coil has a separate RF path, which includes a dedicated broadband amplifier and digital receiver. Each coil is independently computer-controlled with digital phase shifters and programmable attenuators modifying the waveform prior to amplification. This additional control will facilitate feedback driven B1 shimming and other applications.