Compatibility Of Rare Earth Screens With Automatic Exposure Control Systems

James A. Mulvaney; John M. Niemkiewicz; Raymond P. Rossi

doi:10.1117/12.958919

18 August 1980 Compatibility Of Rare Earth Screens With Automatic Exposure Control Systems

James A. Mulvaney, John M. Niemkiewicz, Raymond P. Rossi

Proceedings Volume 0233, Application of Optical Instrumentation in Medicine VIII; (1980) https://doi.org/10.1117/12.958919
Event: Application of Optical Instrumentation in Medicine VIII, 1980, Las Vegas, United States

Abstract

The performance of a General Electric automatic exposure control system with ionization chamber detectors was evaluated over a wide range of kVp's and acrylic phantom thicknesses for four different intensifying screens. For adult phantom thicknesses, the system kept density variations to within +0.2 optical density units for each screen. For pediatric patients, considerable excess density was observed at low mAs which was caused by stored charge in the transformer and cables. The density variations of all four screens were similiar above 70 kVp indicating that a single kVp compensation scheme is adequate for this type of detector. At 50 kVp variable compensation may be required.

Citation Download Citation

James A. Mulvaney, John M. Niemkiewicz, and Raymond P. Rossi "Compatibility Of Rare Earth Screens With Automatic Exposure Control Systems", Proc. SPIE 0233, Application of Optical Instrumentation in Medicine VIII, (18 August 1980); https://doi.org/10.1117/12.958919

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