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Table 4

The relative difference in the electron density from two methods obtained in this study and three other studies.

Selected CT number Study    
  Schneider et al. (1996) Vanderstraeten et al. (2007) Shih and Wu (2017) Current study
400 8.06 8.31 10.54 4.90
600 6.09 5.89 7.41 4.08
800 3.91 3.72 4.83 3.34
1000 2.10 1.94 2.02 2.77

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