1. A method for generating a mixed-energy CT image comprising the steps of: a) administering a first dose of x-rays at a first energy to acquire a first image dataset; b) administering a second dose of x-rays at a second energy that is different from the first energy to acquire a second image dataset; c) selecting at least one of a plurality of weighting metrics including at least one of patient size, dose partitioning, and image quality; d) determining at least one desired weighting factor based on the weighting metrics; and e) creating a mixed-energy image from the first image dataset and the second image data set based on the at least one desired weighting factor.