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. Author manuscript; available in PMC: 2012 Jul 21.
Published in final edited form as: Phys Med Biol. 2011 Jun 30;56(14):4499–4515. doi: 10.1088/0031-9155/56/14/017

Figure 1.

Figure 1

Histograms of relative errors in the stopping power ratios (SPRs) of human tissues estimated using the kV-kV, kV-MV, and MV-MV dual-energy CT (DECT) for (a) standard human tissues, (b) nonstandard human tissues generated by introducing a small variation to the density and elemental composition values of standard human tissues, and (c) human tissues generated by mixing any two standard human tissues in equal volume in simulation of the partial volume averaging effect. The root-mean-square (RMS) error was calculated to describe the overall magnitude of error distribution. The results showed that under ideal conditions (i.e., without imaging artifacts) the DECT method was independent of the x-ray energy pairs.