A CT system in an example comprises one or more high frequency
electromagnetic energy sources, a detection assembly, a data acquisition
system (DAS), and a computer. The one or more high frequency
electromagnetic energy sources emit one or more beams of high frequency
electromagnetic energy toward an object to be imaged. The detection
assembly is capable of measuring a plurality of projection data at a same
projection path that corresponds to a plurality of distinct incident
energy spectra. The detection assembly comprises one or more energy
discriminating (ED) detectors and/or one or more energy integration (EI)
detectors that receive high frequency electromagnetic energy emitted by
the one or more high frequency electromagnetic energy sources. The data
acquisition system (DAS) is operably connected to the one or more ED
detectors and/or the one or more EI detectors. The computer is operably
connected to the DAS.