1. A method for facilitating temporal comparison of breast mammograms by a viewer, comprising: receiving a prior mammogram image set comprising a plurality of mammogram views of the breast, the prior mammogram image set originating from a first mammogram acquisition system and being characterized by a first tissue distance per pixel; receiving a subsequent mammogram image set comprising a corresponding plurality of mammogram views of the breast, the subsequent mammogram image set originating from a second mammogram acquisition system different than the first mammogram acquisition system and being characterized by a second tissue distance per pixel different than the first tissue distance per pixel, each of said mammogram views of each of said prior and subsequent mammogram image sets having a background section and a breast tissue section; and without requiring a scale-adjusting viewer input, displaying for simultaneous viewing all of said mammogram views of said prior and subsequent mammogram image sets on a same mammogram display at an identical tissue distance per unit display distance, said simultaneously displayed mammogram views appearing in a respective plurality of display windows sized according to a hanging protocol, wherein said identical tissue distance per unit display distance is a value for which both (i) the breast tissue section of at least one of the simultaneously displayed mammogram views extends across a high percentage of its display window in at least one of a heightwise and widthwise dimension, and (ii) the breast tissue sections of all of the simultaneously displayed mammogram views are wholly contained in their respective display windows.