FIGURE 7 Maximum intensity projection images produced from subtracting a pre-gadolinium MR mammogram from a post-gadolinium MR mammogram, using (a) no registration), (b) rigid registration, (c) affine registration, and (d) nonrigid registration incorporating deformation. All registration involved maximization of normalized mutual information [29]. The nonrigid deformation algorithm results in much less artifact due to deformation of tissue, making the enhancing lesion easier to identify.

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