A Cross-Power Spectral Method For Improved Measurement Of Film Noise Power Spectra

Y. Lee; P. L. P. Dillon

doi:10.1117/12.967004

1 January 1987 A Cross-Power Spectral Method For Improved Measurement Of Film Noise Power Spectra

Y. Lee, P. L. P. Dillon

Proceedings Volume 0767, Medical Imaging; (1987) https://doi.org/10.1117/12.967004
Event: Medical Imaging, 1987, Newport Beach, CA, United States

Abstract

A cross-power spectral method is described for the separation of the scanning system noise spectrum from the film noise spectrum in a film measuring system. This method provides a more accurate way to measure the true film noise spectrum. The spectral separation is done in two steps: (1) Two samples are taken at each sample position on the film to produce a pair of independently sampled data arrays. (2) The cross-power spectrum is then computed from this pair of arrays using the fast Fourier transforin(FFT) technique. Since film noise and scanner noise are uncorrelated, it is shown that this cross-power spectrum is an estimate of the film noise spectrum. The use of this technique is demonstrated using simulated film data.

Citation Download Citation

Y. Lee and P. L. P. Dillon "A Cross-Power Spectral Method For Improved Measurement Of Film Noise Power Spectra", Proc. SPIE 0767, Medical Imaging, (1 January 1987); https://doi.org/10.1117/12.967004

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