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Radiology, Vol 178, 393-396, Copyright © 1991 by Radiological Society of North America

ARTICLES

Accurate automatic exposure controller for mammography: design and performance

EE Frederick, MR Squillante, LJ Cirignano, RW Hahn and G Entine
Radiation Monitoring Devices, Inc, Watertown, MA 02172.

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.




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Copyright © 1991 by the Radiological Society of North America.