sigpy.mri.rf.shim.init_optimal_spectral

sigpy.mri.rf.shim.init_optimal_spectral(A, sens, preproc=False)

Function to return initial shim weights based on an optimal spectral method, an eigenvector-based method.

Args:

A (linop): sigpy Linear operator. sens (array): sensitivity maps. [Nc dim_x dim_y] preproc (bool): option to apply preprocessing function before finding eigenvectors

Returns:

Vector of complex shim weights.

References:

Chandra, R., Zhong, Z., Hontz, J., McCulloch, V., Studer, C., Goldstein, T. (2017) ‘PhasePack: A Phase Retrieval Library.’ arXiv:1711.10175.