Measurement of Root Mean Square Granularity of X-ray Films Using a Commercial Film Scanner |
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Authors: | Yasuhiro Hosobuchi Kazuhiko Ohnuma |
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Institution: | (1) School of Radiologic Sciences, Faculty of Health Sciences, Tokyo Metropolitan University of Health Sciences, 7-2-10, Higashi-ogu, Arakawa-ku, Tokyo 116-8551, Japan;(2) Graduate School of Science #x0026; Technology, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan |
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Abstract: | Root mean square granularity of films are generally measured using a microdensito-meter, although it is costly and not easily available. To solve the cost problem, we tried to use an inexpensive commercial film scanner. Films with different densities were prepared and the relationship between densities by a diffuse densitometer and pixel values by a film scanner was obtained. We found that a linear relationship exists between rms granularity and a corrected standard deviation of pixel value that is available as an index granularity.This paper was originally presented at the 2nd International Conference on Optical Design and Fabrication, ODF2000 which was held on November 15-17, 2000 at the International Coference Center, Tokyo, Waseda University, Japan. |
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Keywords: | rms granularity film scanner diffuse densitometer standard deviation pixel X-ray film screen |
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