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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 7.

Figure 7

The effect of noise on the calibration of the sensitivity maps has been studied by adding noise to fully-sampled data (noise levels: 1×, 10×, 20×). 1st column: Fully-sampled images corresponding to the first channel for different noise levels. 2nd column: Sensitivity map of the first channel as estimated using the ESPIRiT calibration. 3rd column: The projection of the fully-sampled original data onto the nullspace defined by the sensitivities (scaled by a factor of 5). 4th and 5th column: Reconstruction results for ESPIRiT and GRAPPA for 2 × 2 undersampling.