Image registration is the process of bringing images acquired at different times or with different modalities in to a common coordinate system. Registration is necessary in order to be able to compare or integrate the data obtained from different measurements.
Medical image registration (e.g. for data of the same patient taken at different points in time) often additionally involves elastic (or nonrigid) registration to cope with deformation of the subject (due to breathing, anatomical changes, etc.). Nonrigid registration of medical images can also be used to register a patient's data to an anatomical atlas, such as the Talairach atlas for neuroimaging.
See the
Image Registration article for more information.
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