Abstract
The appearance of the radiographic image results from a complicated interaction between unsharpness due to light diffusion in the screen-film system, quantum mottle, and image shape and contrast. To gain a better understanding of radiographic image formation, these factors are being studied individually. The light diffusion (line spread-function, modulation transfer function) has been measured by means of exposure through a narrow slit. The calculated modulation transfer function yields resolutions of 6 to 10 cycles/millimeter for typical screen-film systems. Quantum mottle has been studied by means of Wiener spectrum analysis. It has been shown that quantum mottle is not only dependent on the number of x-ray quanta absorbed in the screens during the exposure, but is also a function of film contrast and system modulation transfer. The complicated interactions between these factors lead to interesting conclusions regarding radiographic image quality, as shown by the visual comparison of radiographs made wi...
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