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. Author manuscript; available in PMC: 2014 Nov 6.
Published in final edited form as: Magn Reson Med. 2014 Mar;71(3):990–1001. doi: 10.1002/mrm.24751

Figure 5.

Figure 5

Eigenvalue maps computed when using a different number of kernels to estimate the row space V‖ of the calibration matrix A (rows). The percentages with respect to the total number of kernels are shown, corresponding to 101, 57, 44, 33, 21 kernels out of 200. The rightmost column shows a projection of fully-sampled coil images onto the null space as approximated by the sensitivities using Equation [20] (scaled by a factor 5 compared to the corresponding anatomical images in the following figures). If this projection contains residual energy in addition to noise, this indicates errors in the calibration.