Optimal Permittivity of Dielectric Liners and their Effects on Transmit Array Performance

Dielectric pads are used as an effective method to increase the signal locally and also increase the RF field homogeneity in high-field MRI. Here we investigate the effect of dielectric liners of various permittivities on the transmit performance of a head coil array at 4.7T. Results show that field homogeneity and sensitivity are competing goals and a compromise is needed based on the application. An optimal value for permittivity is found which is lower than values which are commonly used in the literature.

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