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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: IEEE Trans Med Imaging. 2015 May 1;34(11):2286–2297. doi: 10.1109/TMI.2015.2429000

TABLE II.

Electron density (1023 e/cm3) for Catphan© contrast rods. The last column is the root-mean-square of material percent errors.

Teflon PMP LDPE Polystyrene Aluminum Acrylic Delrin RMS of
Percent Errors
Actual Electron Density 6.24 2.85 3.16 3.34 7.83 3.83 4.56
Without Noise Suppression 6.04 ± 0.8 2.89 ± 0.6 3.19 ± 0.6 3.38 ± 0.7 7.87 ± 0.9 3.84 ± 0.7 4.49 ± 0.6 1.61 ± 16.15%
IDEM Method (NSW) 5.99 ± 0.2 2.92 ± 0.2 3.25 ± 0.1 3.40 ± 0.1 7.95 ± 0.2 3.78 ± 0.1 4.38 ± 0.2 2.77 ± 3.28%
IDEM Method (SW) 6.03 ± 0.2 2.89 ± 0.1 3.21 ± 0.2 3.40 ± 0.1 7.92 ± 0.2 3.81 ± 0.1 4.45 ± 0.1 1.99 ± 2.78%