1. A mammography unit comprising: a bucky having an imaging area; a compression device comprising an x-ray transparent inflatable chamber; a manifold operatively associated with the inflatable chamber for introducing a fluid into the inflatable chamber, for permitting release of fluid from the inflatable chamber, or both; and, a sound detector capable of detecting Korotkoff sounds; wherein when fluid is introduced into the inflatable chamber of the compression device, at least one surface of the chamber expands and causes expansion of the compression device against a breast positioned on the bucky and causes at least partial occlusion of blood flow to the breast, and wherein when fluid is released from the inflatable chamber of the compression device, blood flow is at least partially restored to the breast and Korotkoff sounds are generated.