نتایج جستجو برای: sensitometry
تعداد نتایج: 38 فیلتر نتایج به سال:
To determine the characteristic curve of the radiographic screen/film systems in a short focal spot-film distance, the inverse square sensitometric method was modified by changing the radiation intensity with two kinds of filters. The characteristic curves obtained in the two exposure series with these two kinds of filters were overlapped to obtain a complete one. The characteristic curve thus ...
Abstract Treatment planning in ion beam therapy requires accurate knowledge of the relative stopping power (RSP) distribution within patient. Currently, RSP maps are obtained via conventional x-ray computed tomography (CT) by converting measured attenuation coefficients photons into values for ions. Alternatively, to avoid conversion errors that inherent this method, (iCT) can be used since it ...
BACKGROUND: The purpose of this study was to evaluate the sensitometric characteristics of Ultraspeed, Ektaspeed Plus and Insight dental radiographic films using manual and automatic processing systems. METHODS: In this experimental invitro study, an aluminum step-wedge was used to construct characteristic curves for D-, E- and F-speed radiographic films (Kodak Eastman, Rochester, USA). All fil...
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