1. A method for facilitating viewer comparison of a plurality of medical images of at least one body part on a softcopy review workstation, the softcopy review workstation including at least one processor and a display device, the method being implemented by the softcopy review workstation, the method comprising: receiving, by the softcopy review workstation, first and second medical images of the at least one body part; and displaying, by the softcopy review workstation, said first and second medical images on said display device such that the second medical image appears as a spatially registered underlay to the first medical image exposed through a first aperture therein, the first medical image masking the second medical image outside the first aperture, the second medical image masking the first medical image inside the first aperture, 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.