1. An imaging system that allows for modification of data acquisition parameters, where the parameters affect dose distribution, comprising: a library of exams; and a computer programmed to: obtain a set of scanning parameters for image data acquisition and image reconstruction; obtain scan data from the library of exams that is based on a similarity metric for a patient to be scanned; simulate a new scan of the patient using the obtained scan data and using the obtained set of scanning parameters; and generate a new set of scanning parameters based on the simulation.