1. A method for generating molecular breast imaging (MBI) images, said method comprising: generating at least one energy spectrum using an emission dataset acquired by imaging a patient, identifying a tail energy region and a peak energy region in the energy spectrum; determining a quantity of counts in the tail energy region and the peak energy region; generating an energy window for the energy spectrum based on the counts in the tail energy region and the peak energy region; and assigning a pixel intensity value to at least one image pixel based on a plurality of counts in the energy window.