1. A method for facilitating viewer comparison of a plurality of medical images of at least one body part on a softcopy review workstation, comprising displaying first and second medical images such that the second medical image appears as a spatially registered underlay to the first medical image exposed through a first aperture therein, said first aperture having at least one edge that is viewer-manipulable in a back-and-forth manner so that the first and second medical images can be visually compared with minimal eye movement.