Mammography units

We evaluated eight mammorgraphy units from five manufacturers, basing our tests on the units' screen-film imaging capability. Our ratings were based primarily on the units' ability to safely and consistently produce acceptable images with minimal patient dose. One unit is rated Acceptable-Preferred, two units are rated Acceptable, two units are rated Acceptable but not recommended for magnification applications, and three units are rated Conditionally Acceptable because of poor automatic exposure control performance.