Variation With kVp Of Exposure And Attenuation Throughout A Radiographic System And Assessment Of The Speed Of Films, Screens, And Processors

Cupido Daniels; Kenneth W. Taylor

doi:10.1117/12.931785

16 July 1981 Variation With kVp Of Exposure And Attenuation Throughout A Radiographic System And Assessment Of The Speed Of Films, Screens, And Processors

Cupido Daniels, Kenneth W. Taylor

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Proceedings Volume 0273, Application of Optical Instrumentation in Medicine IX; (1981) https://doi.org/10.1117/12.931785
Event: Application of Optical Instrumentation in Medicine, 1981, San Francisco, United States

Abstract

To find the reasons for unnecessary exposure to patients and in assessing the performance of a radiographic system one needs to know the exposure to and the attenuation of the various components of that system. We used a water phantom to simulate patients of different thicknesses and for each, using a standard technique, measured the entrance, exit and cassette exposure to produce an optical density of 1.0 on the film of a common film-screen combination. The ratio of entrance to exit exposure is an indication of beam quality and the ratio of exit to cassette exposure is the reciprocal of the attenuation by the material between the patient and the cassette. These ratios for our laboratory system are used as standards against which beam quality and table-top, grid and phototimer attenuation are assessed. Measurement of the cassette exposure needed to produce a film of unit optical density when the different components of hospitals' film-screen-processor systems are interchanged with our laboratory system is a simple method of assessing, under clinically simulated conditions, the relative performance of hospitals' films, screens and processors. Results obtained in hospitals across Ontario will be presented.

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Cupido Daniels and Kenneth W. Taylor "Variation With kVp Of Exposure And Attenuation Throughout A Radiographic System And Assessment Of The Speed Of Films, Screens, And Processors", Proc. SPIE 0273, Application of Optical Instrumentation in Medicine IX, (16 July 1981); https://doi.org/10.1117/12.931785

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KEYWORDS

Signal attenuation

Imaging systems

Absorbance

X-rays

Aluminum

Standards development

Calibration

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