Film-Screen Speed System Considerations

R. S. Holland

doi:10.1117/12.943202

28 August 1984 Film-Screen Speed System Considerations

R. S. Holland

Proceedings Volume 0486, Medical Imaging and Instrumentation '84; (1984) https://doi.org/10.1117/12.943202
Event: Medical Imaging and Instrumentation '84, 1984, Las Vegas, United States

Abstract

The broad speed classes into which film-screen receptor systems are now commonly grouped create considerable confusion and uncertainty in relating exposure and dose to properly exposed films. Practical speeds become even less certain by relating the whole speed scale to a reference system which is not uniquely defined. A system to overcome these difficulties is proposed, in the form of a scale of absolute speeds, based on a recent ANSI test method, and grouping resultant speeds into narrower classes. Data are presented which relate this recommended speed class width to allowable density ranges and to typical distributions of product speed.

Citation Download Citation

R. S. Holland "Film-Screen Speed System Considerations", Proc. SPIE 0486, Medical Imaging and Instrumentation '84, (28 August 1984); https://doi.org/10.1117/12.943202

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