Fig. 2.

Modified dictionary using segmentation: (a) An example SPGR T1-w contrast atlas image φ₁ [16] from a GE 3T scanner, (b) its MPRAGE T1-w contrast φ₂, (c) their TOADS [1] segmentation S_φ, used to generate the sub-dictionaries ${\mathbf{\Phi }}_1^{(l)}$ and ${\mathbf{\Phi }}_2^{(l)}$ according to Eqn. 10, (d) An SPGR T1-w subject image Y₁ [12], (b) an approximate hard segmentation S_Y (obtained from TOADS), used to choose a reduced sub-dictionary