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Optimal kVp selection for dual-energy imaging of the chest: Evaluation by task-specific observer preference testsWilliams, D. B.; Siewerdsen, J. H.; Tward, D. J.; Paul, N. S.; Dhanantwari, A. C.; Shkumat, N. A.; Richard, S.; Yorkston, J.; Van Metter, R. · Medical Physics · 2007