Accurate automatic exposure controller for mammography: design and performance.
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.
Frederick
E E
EE
Radiation Monitoring Devices, Inc, Watertown, MA 02172.
Squillante
M R
MR
Cirignano
L J
LJ
Hahn
R W
RW
Entine
G
G
D005260:Female; D006801:Humans; D008327:Mammography / Q000295:instrumentation* / Q000379:methods; D013679:Technology, Radiologic