We present a tool to quickly estimate the noise induced by the resistance of a surface coil and the noise induced by the coil in a sphere. The tool relies on two analytical solutions, and results depend on many parameters. We show plots of the dissipated power in the sample and the coil as function of some of these parameters such as the diameter of the coil, the distance of the coil from the sphere and the wire diameter of the coil. The tool can be useful in the design process of coils, especially dense receive arrays.
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