The Influence Of Grain Threshold On Quantum Mottle In Radiographic Screen-Film Systems II

Majid Rabbani; Rodney Shaw

doi:10.1117/12.968623

27 June 1988 The Influence Of Grain Threshold On Quantum Mottle In Radiographic Screen-Film Systems II

Majid Rabbani, Rodney Shaw

Proceedings Volume 0914, Medical Imaging II; (1988) https://doi.org/10.1117/12.968623
Event: Medical Imaging II, 1988, Newport Beach, CA, United States

Abstract

In part I of this work we described an exact analytical solution for the zero-frequency Wiener spectrum of radiographic screen-film noise, modeling the nonlinear grain response as a 2-quantum threshold. We now extend our results to a full Wiener spectrum description of the image noise. Furthermore, to simulate a wide range of grain quantum sensitivities, we modify our film model to allow for each absorbed light quanta to randomly contribute to the final development of the grain. We find an analytical expression for the circularly symmetric covariance function associated with the random variable denoting the transmittance of each grain. The Wiener spectrum is obtained as the Hankel transform of this covariance function. In this way we calculate the Wiener spectrum for a full range of imaging variables (screen amplification, point spread function, exposure, etc.).

Citation Download Citation

Majid Rabbani and Rodney Shaw "The Influence Of Grain Threshold On Quantum Mottle In Radiographic Screen-Film Systems II", Proc. SPIE 0914, Medical Imaging II, (27 June 1988); https://doi.org/10.1117/12.968623

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