On the field inhomogeneity of a birdcage coil

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Abstract
A mathematical model is developed for the numerical analysis of birdcage coils constructed using capacitors having different capacitance. With the aid of this model, it is shown that the deviation of some capacitance introduced by tune, balance, and drive mechanisms can cause inhomogeneity in the B1, field produced by the coil. Useful curves and formulae are developed to provide a guideline for the design of birdcage coils.

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