Non-Cartesian GRAPPA and coil combination using interleaved calibration data - application to concentric-ring MRSI of the human brain at 7T.

Although a direct comparison between constant‐undersampling and variable‐density undersampling with identical effective acceleration was not possible, our results show a clear trend that a variable‐density undersampling yields more robust and artifact‐reduced reconstructions, which may not only be reflected in significantly lower CRLB values, but also in increased spectral and metabolic map quality.

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