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(a) Computation time for populating encoding matrices (eight transmitters, 64×64 excitation resolution, reduction factor of two) using one CPU thread (stars), four CPU threads (triangles), one GPU (squares) and four GPUs (circles) as a function of the coefficient matrix size. (b) CGLS computation time as a function of the coefficient matrix size. Coefficient matrices of different sizes were generated using different dwell time for RF pulses.
