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. 2006 Jul 22;36(Suppl 2):126–135. doi: 10.1007/s00247-006-0220-4

Fig. 8.

Fig. 8

The effect on the X-ray beam spectrum of adding copper to the X-ray beam. The generator increases the kVp to compensate for the lost intensity in the X-ray beam. The effective energy increases from approximately 30 keV to approximately 55 keV (reprinted with permission from Philips Medical Systems [22])