Microdose mammography

Tens of thousands of mammograms are performed daily in the United States. Accumulated radiation biologic data suggest that approximately 90-rad is the level of radition to the breast above which the incidence of cancer may be increase. A microdose system of roentgenography is described that provides better images at one-third to one-fifth the exposure of the commonly used low-dose system and about one-eight to one-tenth the dose of Xeromammography. This system should allow for repeated x-ray study in a patient as required, without exceeding the critical level.