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Typical X-ray spectra used in medical CT. Representative spectra at 70, 80, 100, 120, and 140 kVp, after standard pre-filtration, are shown. Their mean energies range between 47 and 69 keV. The Sn kV spectrum is obtained after pre-filtration with 0.4 mm Sn (tin) to preferentially remove lower energy X-ray quanta and shift the mean energy of the spectrum to higher values. Image from page 4 of [215].
