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Detectability as a function of factors contributing to image noise and dose for the three imaging tasks. The right column plots the integral over the 3D NEQ. The superimposed lines identify the generator power required for a given kVp and dose. While there is clearly no “optimum” in dose or σadd, reasonable operating points of D = 5 mGy and σadd = 2000 e are identified, and regions of diminishing return are evident.
