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Optical Engineering

Characteristics and Limitations of Photographic Films Used in Subtraction Radiography
Author(s): Michael G. Ort; Earle C. Gregg
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Paper Abstract

An investigation was made to evaluate currently used subtraction radiography techniques. The first order subtraction technique was found to be adequate for conventional clinical use. However when using fine-grain high contrast films for the originals, the second order technique gave a more accurate subtraction image. The limiting factor in the sensitivity of the radiographic subtraction technique for detecting small contrast changes over an area of about 2 cm in diameter was found to be film noise and not quantum statistics. Extra-fine-grain films were compared with conventionally used films. While these extra-fine-grain films gave slightly better results, they also required x-ray exposures which would be too high for routine clinical use.

Paper Details

Date Published: 1 August 1976
PDF: 4 pages
Opt. Eng. 15(4) 154349 doi: 10.1117/12.7971991
Published in: Optical Engineering Volume 15, Issue 4
Show Author Affiliations
Michael G. Ort, Case Western Reserve University (United States)
Earle C. Gregg, Case Western Reserve University (United States)


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