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. Author manuscript; available in PMC: 2010 Dec 9.
Published in final edited form as: Phys Med Biol. 2010 Jan 28;55(4):1141–1155. doi: 10.1088/0031-9155/55/4/016

Figure 1.

Figure 1

Measured x-ray energy spectra at 80 kVp with 2 mm aluminum (solid line) and 200 mm molybdenum (dashed line) filters. The average energy is 46.4 and 55.4 keV for the Al and Mo filters, respectively.