FIGURE 4. Reference images (interictal), registered and normalized images (ictal), and corresponding subtraction images (ictal–interictal), which were obtained by 3 different normalization methods (Max, Mean, and DSC-2). Images in A, B, and C are from same patients as in Figures 3A, 3B, and 3C, respectively. Isocontours drawn from reference images are superimposed on all images. Subtraction images are saturated at 30% of maximum of reference images, but no background has been removed.

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