Keywords: Physics & Engineering: Hardware, Neuro: Brain, Physics & Engineering: High-Field MRI
At clinical fields (1.5T and 3T), volume coils are usually used for excitation and multichannel local surface coils for receiving a signal. At higher fields, volume coils cannot produce homogeneous excitation due to intrinsically shorter wavelength in a tissue which causes constructive and distractive interference effects. For that reason, transmit only or transcieve (both transmit and receive) multichannel arrays are introduced. In those arrays, individual elements can be fed independently where magnitude/phase and RF waveforms can be optimized to produce desired B1+ field. In this talk, we will analyze different coil concepts used as array elements in brain imaging applications.