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Effect of quantum mottle and modulation transfer on the measurement of radiographic image quality



Effect of quantum mottle and modulation transfer on the measurement of radiographic image quality



Proceedings of the Second Colloquium on Diagnostic Radiologic Instrumentation: Modulation transfer function, Chicago, Ill , April, 1964 350-369



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. It is difficult, therefore, to develop a general technique for measuring radiographic image quality which holds for all types of images under any imaging condition. To bring some order into this complex problem, the parameters affecting radiographic image quality are being studied individually by means of line spread-function, modulation transfer function, Wiener spectrum, and contrast-detail diagram analysis. Comparison of these measurements with visual examinations of radiographs shows that it is impossible, in general, to express the quality of screen-film systems by a single number. To support this general conclusion, the results of subjective and objective evaluations of 2 commercial screen-film systems are discussed in detail. It is shown that Wiener spectrum analysis of the quantum mottle obtained with the 2 systems predicts qualitatively the appearance of radiographs of a test object containing inherently sharp, high-contrast and unsharp, low-contrast images.

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