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2 May 1997 Regional SNR optimization in dual-screen computed radiography (CR) imaging
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Dual-screen CR imaging technique can be used to improve x- ray absorption and image signal-to-noise ratio (SNR). Previous research has shown that it is possible to optimize the image superimposition process for best SNR in the superimposed image. Optimal weighting factors and SNRs have ben theoretically derived and related to the SNRs in the front and back images. The relationship has been experimentally verified. Practical implementation of the technique, however, involves non-uniform image signals and SNRs. To understand how the optimal weighting factors can be determined and how they vary spatially in non-uniform images, theoretical, numerical and experimental studies have been conducted. The results indicate that spatial variation of optimal weighting factors is minimal. An empirical method can be used to determine the optimal weighting factors over regions with minimal signal non-uniformity. The resulting weighting factors can be applied to superimposition of the entire front and back images for best SNR.
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Chris C. Shaw and Darryl S. Breitenstein "Regional SNR optimization in dual-screen computed radiography (CR) imaging", Proc. SPIE 3032, Medical Imaging 1997: Physics of Medical Imaging, (2 May 1997);

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