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Proceedings Paper

X-ray tube voltage dependence of Rossmann's three factors in Wiener spectra of radiographic mottles of a low-speed screen/film system
Author(s): Hidetaka Arimura; Takaharu Ikeda; Takeshi Ikari; Hideaki Kubota; Masao Matsumoto; Atsushi Takigawa; Nobuyuki Nakamori; Hitoshi Kanamori
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Paper Abstract

We obtained the tube voltage dependence of the Wiener spectra of the radiographic mottles of the front and back emulsions made using a low-speed screen and an anticrossover film. The Wiener spectral values of the front emulsion are almost constant, while those of the back emulsion increase with the tube voltage. The spectral values of the front emulsion are greater than those of the back emulsion at most of densities. In order to investigate the reason of these phenomena, we separated the radiographic mottle into the three factors. As a result, we have found that the reason of the dependence of the radiographic mottle is that the contribution of the quantum mottle is less than that of the structure mottle. The Wiener spectral values of the structure mottle of the front screen are greater than those of the back screen for most of the tube voltages. The Wiener spectral values of the front screen decrease and those of the back screen increase with the tube voltage, and the two curves cross at high voltage. These reasons were explained from the spatial fluctuation of the thickness of the screen due to the nonuniform screen structure and the attenuation curve of the x-ray intensity. The tube voltage dependence of the quantum mottle was explained from that of the number of photons absorbed in the screen.

Paper Details

Date Published: 1 May 1994
PDF: 12 pages
Proc. SPIE 2163, Medical Imaging 1994: Physics of Medical Imaging, (1 May 1994); doi: 10.1117/12.174275
Show Author Affiliations
Hidetaka Arimura, Shimadzu Corp. (Japan)
Takaharu Ikeda, Kyoto Institute of Technology (Japan)
Takeshi Ikari, Kyoto Institute of Technology (Japan)
Hideaki Kubota, Shiga Univ. (Japan)
Masao Matsumoto, Osaka Prefectural College of Technology (Japan)
Atsushi Takigawa, Osaka Univ. (Japan)
Nobuyuki Nakamori, Kyoto Institute of Technology (Japan)
Hitoshi Kanamori, Kyoto Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 2163:
Medical Imaging 1994: Physics of Medical Imaging
Rodney Shaw, Editor(s)

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