Recent progress in noise reduction and scatter correction in dual-energy imaging
We report on several new techniques which we are developing for scatter correction and noise suppression in single-shot dual-energy chest radiography. For scatter, we use a deconvolution technique to correct for the scatter produced within the dual-energy cassette, which can result in scatter fractions as high as 30% in the high-energy image. For patient scatter, we have developed a technique which estimates the scatter by viewing each pixel in the image as a scattering source, and summing up its scatter contribution over all pixels. For scatter suppression, we describe the methods of noise clipping and noise forcing, both which use information from the low- and high-energy images to correct pixel values in the high-energy image which are unphysical. The noise clipping can also be combined with the correlated noise reduction technique, in order to combine the strengths of the two methods.
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