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3D SIFT-Rank feature correspondences in a right-frontal anaplastic astrocytoma between 3D ultrasound images. In each of a–h white circles represent the local and scale of a single scale-invariant feature in three orthogonal image slices, automatically identified in two different ultrasound volumes (upper and lower triplets). Note the high degree of visual similarity in the upper and lower images, surrounding the feature of interest
