X-ray tube voltage dependence of three factors of radiographic mottle for single and double emulsions

Hidetaka Arimura; Mitsuhide Okamoto; Takeshi Ikari; Hideaki Kubota; Masao Matsumoto; Atsushi Takigawa; Nobuyuki Nakamori; Hitoshi Kanamori

doi:10.1117/12.237820

11 April 1996 X-ray tube voltage dependence of three factors of radiographic mottle for single and double emulsions

Hidetaka Arimura, Mitsuhide Okamoto, Takeshi Ikari, Hideaki Kubota, Masao Matsumoto, Atsushi Takigawa, Nobuyuki Nakamori, Hitoshi Kanamori

Author Affiliations +

Proceedings Volume 2708, Medical Imaging 1996: Physics of Medical Imaging; (1996) https://doi.org/10.1117/12.237820
Event: Medical Imaging 1996, 1996, Newport Beach, CA, United States

Abstract

We have obtained the density or x-ray tube voltage dependence of the Wiener spectra of the three factors of radiographic mottle, i.e., quantum mottle, structure mottle, and film granularity, for the double emulsions of the x-ray film. For the purpose, we proposed a method for obtaining the Wiener spectrum of each of the three factors for the double emulsions. To investigate the relation between the Wiener spectra of the quantum mottle for the double and single emulsions, we compared the Wiener spectra of the quantum mottle for the double emulsions with the sum of those for the front and back emulsions on the same radiographs. The Wiener spectral values of the quantum mottle for the double emulsions at 0 mm^-1 were greater than the sums of the Wiener spectral values of the quantum mottle for the front and back emulsions at tube voltages of 50 to 100 kV. We found that this was the result which originated from the following phenomena: (1) the noise-equivalent numbers of quanta (NEQ) of the dual screens were roughly equal to the sum of the NEQ of the front and back screens; (2) the squares of the gradients for the double emulsions were more than four times on an average as great as those for the front and back emulsions.

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Hidetaka Arimura, Mitsuhide Okamoto, Takeshi Ikari, Hideaki Kubota, Masao Matsumoto, Atsushi Takigawa, Nobuyuki Nakamori, and Hitoshi Kanamori "X-ray tube voltage dependence of three factors of radiographic mottle for single and double emulsions", Proc. SPIE 2708, Medical Imaging 1996: Physics of Medical Imaging, (11 April 1996); https://doi.org/10.1117/12.237820

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KEYWORDS

X-rays

Radiography

Photons

Spatial frequencies

Luminescence

Modulation transfer functions

Aluminum

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