A Nested Eight-Channel Transmit Array With Open-Face Concept for Human Brain Imaging at 7 Tesla

Purpose: Parallel transmit technology for MRI at 7 tesla will significantly benefit from high performance arrays that offer efficiency and low mutual coupling between the individual array elements. A novel dual-mode with nested elements has been developed to support imaging human brain in both single-channel (sTx) parallel-transmit (pTx) excitation modes of a scanner. In this work, design, implementation, validation, specific absorption rate (SAR) management, head coil is presented. Methods: The consisted arrangement improve decoupling second-neighboring Two large cut-outs were introduced RF shield an open-face design reduce claustrophobia allow patient monitoring. hardware interface allows be used sTx pTx modes. SAR monitoring done virtual observation points (VOP) derived body models. coverage compared commercial coils. Results: Decoupling inductors reduced less than −20 dB. Local estimates electromagnetic (EM) simulations always EM-based VOPs, which turn scanner predictions measurements static dynamic waveforms. mode, we demonstrate improved coil. within 10% despite two shield. signal homogeneity was shown when Universal Pulse acquisition vivo . Conclusion: includes eight-channel claustrophobia. For EM simulation VOP-based management provided greater flexibility apply methods without limitations constraints. scanning , provide mode standard