FIG. 3.

Presented on a magnitude brain phantom underlay are theoretical operator induced real/real, imaginary/imaginary, real/imaginary spatial correlations, and temporal correlations of the center voxel under the assumption of SENSE reconstruction and smoothing with (a₁–a₄) identity intrinsic k-space covariance, (b₁–b₄) nonidentity intrinsic k-space covariance, (c₁–c₄) band-pass filtering with identity intrinsic k-space covariance, (d₁–d₄) band-pass filtering with nonidentity intrinsic k-space covariance. The intrinsic spatial correlation masks for the considered cases are illustrated in (a₅–d₅).