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Accurate automatic exposure controller for mammography: design and performance
E E Frederick1, M R Squillante, L J Cirignano
1Radiation Monitoring Devices, Inc, Watertown, MA 02172.
Radiology
|February 1, 1991
Abstract:
An automatic exposure controller has been designed that controls the optical film density for film, screen, and radiographic techniques typically used in mammography to within 0.05 over a range of 1.3-6.7-cm thickness of Lucite. This degree of accuracy is better than that reported for presently available controllers. The detector system consists of four cadmium telluride detectors and involves the use of a control algorithm to read the detectors and turn off the mammography unit at the correct time. This algorithm is implemented by a microprocessor, which also provides the means for a convenient calibration.