Based on theoretical considerations and simulations of correlated stochastic noise-like fluctuations Shaw and Rabanni have predicted that the calculation of noise power spectra via the physical autocorrelation function may offer significant signal to noise ratio advantage over more conventional methods. In this paper noise power spectra of actual film-screen systems calculated by the standard direct Fourier transform method are compared with those obtained via the autocorrection function. We confirm that noise power spectra derived from the autocorrelation function are less sensitive to non-stochastic perturbations in the data and thus provide a more accurate representation of the noise characteristics of film-screen systems. This is of great importance when attempting to relate measurements to mechanistic models of the screen and film imaging parameters.

Date Published: 14 September 1993
PDF: 10 pages
Proc. SPIE 1896, Medical Imaging 1993: Physics of Medical Imaging, (14 September 1993); doi: 10.1117/12.154604

Published in SPIE Proceedings Vol. 1896:
Medical Imaging 1993: Physics of Medical Imaging
Rodney Shaw, Editor(s)