I did some research and it seems that the resolution of conventional film radiography is a little better than the 'film-less' radiography and this makes conventional film somewhat better for mammography. In mammography, one needs good film resolution to detect microcalcifications and subltle spiculated lesions that might be masked by the surrounding breast parenchyma. I suspect that as digital gets better this will all change. But this continued use of conventional film for mammography is, I believe, the reason that there are still high prices on the x-rite sensitometers. As 'film-less' imaging takes over the field of mammography I suspect these x-rite sensitometers will really come down in price.