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In this paper, a convex-optimization based design method is proposed to solve the near-field beamformer design problem for improving the performance of an MRI system. The aim is to find the minimum number of antennas required for a uniform circular array which is capable of forming a beam with a pre-defined sidelobe attenuation level for an arbitrary focal point within a given circular scanning area...
A simple method for the design of a class of arrays with frequency invariant beam patterns is proposed. Starting from the desired frequency invariant beam pattern of an n-D array, the proposed method uses a series of substitutions and an n-D inverse Fourier transform to obtain the desired frequency responses of the filters following each sensor. Given their desired frequency responses, these filters...
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