M S Welkowsky

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The x-ray photon energies that give the highest signal-to-noise ratios per unit of exposure or average dose in mammography are significantly greater than those used in current film/screen systems. Optimum photon energies for detection of calcifications in a range of thicknesses of water and fat were calculated. Soft-tissue targets were also considered.(More)
This paper is composed of two distinct portions. In the first part, we introduce modified versions of the Hughes silicon liquid crystal light valve with wavefront distortions of better than lambda/4, a resolution of 16 line pairs/mm at 50% modulation concurrent with a contrast ratio of 20:1. In the second portion, we present the results and analysis of a(More)
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