A new method for microdensitometer slit length correction of radiographic noise power spectra

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Abstract
When the power spectrum of radiographic noise is estimated from scans obtained with a microdensitometer equipped with a rectangular slit, a bias is present due to the finite length of this slit. A method to correct for this bias was developed and was tested on both a simulated and a measured spectrum. No bias remains with our method, in situations where a conventional method shows a significantly biased result. Good agreement was found with the synthesized slit method, described by Sandrik and Wagner.

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