TY - GEN
T1 - X-ray tube voltage dependence of Rossmann's three factors in Wiener spectra of radiographic mottles of a low-speed screen/film system
AU - Arimura, Hidetaka
AU - Ikeda, Takaharu
AU - Ikari, Takeshi
AU - Kubota, Hideaki
AU - Matsumoto, Masao
AU - Takigawa, Atsushi
AU - Nakamori, Nobuyuki
AU - Kanamori, Hitoshi
PY - 1994/12/1
Y1 - 1994/12/1
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:0028756826
SN - 0819414581
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 42
EP - 53
BT - Proceedings of SPIE - The International Society for Optical Engineering
A2 - Shaw, Rodney
PB - Publ by Society of Photo-Optical Instrumentation Engineers
T2 - Medical Imaging 1994: Physics of Medical Imaging
Y2 - 13 February 1994 through 14 February 1994
ER -