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Abstract:
Most MRI studies benefit from good homogeneity of the transmit magnetic field. We presented numerical investigation for a set of array/load configurations obtained by RF circuit and frequency domain 3-D EM co-simulation. This is a very powerful and fast method for array coil investigation, since one multi-port 3-D EM simulation, which can be calculated in a reasonable time, is sufficient for obtaining the array field homogeneity with any different tuning/feeding/decoupling conditions. We applied capacitor and inductor based decoupling net-works and compared their array homogeneity obtained when the power reflected by the entire coil was minimized. The optimal separation between load and array giving best homogeneity without visible degradation of mean B1+ over the center transverse slice is in the range of 30-45 mm. This result assists the design of transmit-only/receive-only (TORO) arrays, because about 40mm separation provides adequate space for an RX-only coil.
