Graduate Thesis Or Dissertation
 

A study of relative speeds of medical x-ray film and intensifying screen combinations

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  • The objective of this study was to determine the relative speeds of available medical x-ray films exposed directly to x-rays and exposed in combination with various types of intensifying screens. The information obtained from this sensitometric data was used to obtain factors by which a radiographic exposure technique with one film-screen combination could be modified to obtain an adequate radiograph with any of the other films or film-screen combinations. All of the films were exposed using a conventional diagnostic x-ray machine and processed in an automatic processor. The sensitometric data were tested by producing radiographs with the various films and film-screen combinations using the basic exposure technique and the exposure factors obtained from the relative speeds. The radiographic subject was a phantom made of tissue equivalent plastic which encased human skeletal parts. The radiographic results of the testing indicated that adequate radiographs can be obtained using this data. Assuming that the basic radiograph has an average density of 1.0, a second radiograph using a different film-screen combination will have an average density which will not deviate from 1.0 by more than ± 0.15.
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  • File scanned at 300 ppi using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
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