Meeting Banner
Abstract #1522

Transmit Coil Decoupling of 8-Channel Coil Arrays with Ultra-Low Output Impedance RF Power Amplifiers

Desmond Teck Beng Yeo1, Eric Fiveland1, Randy Giaquinto1, Tingting Song2, Xing Yang2, Keith Park1, Adam B. Kerr3, Xu Chu2, Ileana Hancu1

1GE Global Research, Niskayuna, NY, United States; 2GE Global Research, Shanghai, China; 3Department of Electrical Engineering, Stanford University, Stanford, CA, United States

Inter-element inductive coupling presents an important challenge in parallel transmit coil arrays. An ultra-low output impedance RF amplifier (RFPA) was previously introduced to address this issue. In this work, the improvements in transmit decoupling between the ultra-low output impedance RFPAs and conventional RFPAs under different loading conditions were investigated with two types of coil arrays. Bench tests and imaging studies performed on a 3T MR scanner with 8-channel transmit and receive flat array and cylindrical coils showed improved inter-element transmit decoupling, and, strong correlation between image-based B1+ decoupling measures and inter-element scattering parameters (S21).