1. A method for adaptive registration of a set of three dimensional medical images corresponding to first and second acquisitions of a particular patient by a single imaging modality, wherein a first acquisition image and a second acquisition image differ in one of background signal intensity and signal intensity of analogous structures, comprising: obtaining medical image data produced by a single medical imaging modality at first and second acquisition times; prior to any resampling, estimating an amount of patient motion that occurred between first and second acquisitions of the data by the medical imaging modality; selectively performing one of a two dimensional image resampling, a three dimensional image resampling, and no image resampling based on the estimated amount of patient motion; and generating a medical image representative of internal anatomical features of the patient.