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. Author manuscript; available in PMC: 2021 May 27.
Published in final edited form as: Magn Reson Med. 2016 Jan 17;77(1):209–220. doi: 10.1002/mrm.26110

Figure 4.

Figure 4

Noise covariance matrices for standard and virtual coil configurations obtained using an 8-channel breast coil with conventional and multiband acquisitions, respectively. The noise covariance matrix of the standard coil configuration is replicated along the diagonal of the covariance matrix for the virtual coil configuration as many times as the number of passes necessary to sweep the required FOV. As a result, g-factor is on average lower for multiband (b) than for the conventional, full-FOV acquisition (a).