1. A system for providing co-registration between a first digital image of an object derived by means of diffuse photon propagation through the object and a second digital image of the object, the second digital image of the object having a configuration similar to a configuration of the first digital image of the object, the system comprising: a database for storing the first and second digital images of the object, wherein the first and second digital images of the object represent a same part of the object; a graphical user interface for allowing a user to: view the first and second digital images of the object, select N first data points of the object in the first digital image of the object for identifying N features of the object, and select in the second digital image of the object N second data points of the object, corresponding to the N first data points of the object, for identifying the N features of the object; and a co-registration module for enabling a spatial warping of one of the first and second digital images of the object with respect to the other one of the first and second digital images of the object by a compression or an extension of the first digital image of the object, along at least one axis defined by two or more of the N first data points, or by a compression or an extension of the second digital image of the object, along at least one axis defined by two or more of the N second data points, so that at least M of the N features of the object on the one of the first and second digital images of the object are mapped to corresponding at least M of the N features of the object on the other one of the first and second digital images of the object.