The Paper


	The Paper's Abstract of The 3rd International Conference on Imaging Science and Hardcopy

		Proportionality between Wiener spectra of quantum mottle and squares of the MTFs

May 26-29,1998 Chongqing China		Hidetaka Arimura, Hideaki Kubota, Masao Matsumoto, and Hitoshi Kanamori** Tokyo Women's Medical College, Shinjuku-ku, Tokyo 162, Japan Faculty of Medicine, Osaka University, Suita 565, Japan *Fukui University of Technology, Gakuen, Fukui 910, Japan Hiroshima International University qyn02264@nifyserve.or.jp
		Abstract:
		The quantum mottle is the x-ray image noise made using x-ray-imaging systems, such as screen-film systems, imaging plate systems, digital radiography systems, and so on. Rossmann proposed that the Wiener spectral value of the quantum mottle is proportional to the square of the modulation transfer function(MTF) of the screen-film system. On the other hand, Lubberts theoretically pointed out that the shape of the Wiener spectrum of the quantum mottle depended on the sum of the squares of the MTFs for different depths in the screen phosphor layer, rather than the square of the sum of the MTFs for the different depths, which is the square of the MTF of the screen-film system measured by the slit method. The purpose of this paper is to investigate the proportionality between the Wiener spectrum of the quantum mottle and the square of the MTF of the screen-film system. For the thin Quanta Detail screen, the Wiener spectra of the quantum mottle were proportional tothe square of the MTF of the screen-film system. On the contrary, for the thick Quanta \III~screen, the ratio of the Wiener spectra of the quantum mottle to the square of the MTF of the system increased with the spatial frequency. The relation between the Wiener spectrum of the quantum mottle and the MTF of the screen-film system, for a thin screen, agreed with Rossmann's theory, whereas, for a thick screen, agreed with Lubberts's theory.


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