Table 1: Percent CT number accuracy and percent noise reduction observed in five clinical cases. Both CT number and standard deviation are measured in a ROI ( pixels) in the relative smooth liver region, such as those shown in Figures 4 and 5. ACNR: anticorrelated noise reduction [12].

DatasetBasis materialAlgorithmMean density (mg/cc)Standard deviationAbsolute density error (mg/cc)% Density error% Noise reduction

Case
(Figure 4)
WaterOriginal29.1672.22
ACNR26.0024.263.1610.8%66.4%
Proposed27.8530.291.314.5%58.1%
IodineOriginal−961.4129.71
ACNR−961.229.450.190.002%68.2%
Proposed−961.3310.320.080.008%65.3%

Case
(Figure 5)
WaterOriginal15.2888.27
ACNR24.2527.998.9758.7%68.3%
Proposed15.4228.170.140.9%68.0%
IodineOriginal−967.9231.42
ACNR−967.419.830.510.05%68.7%
Proposed−966.3110.980.610.2%65.1%

Case WaterOriginal5.7485.39
ACNR6.8125.991.0718.6%69.6%
Proposed5.9327.070.193.7%68.3%
IodineOriginal−934.5034.77
ACNR−935.879.261.370.2%73.2%
Proposed−935.619.911.110.2%71.5%

Case WaterOriginal9.4245.94
ACNR7.4815.891.9420.6%65.4%
Proposed8.7016.570.727.6%63.9%
IodineOriginal−993.7212.84
ACNR−994.563.410.840.08%73.4%
Proposed−994.253.940.530.05%69.3%

Case WaterOriginal12.98161.68
ACNR15.8148.472.8321.8%70.0%
Proposed13.8551.200.876.7%68.3%
IodineOriginal−990.1920.36
ACNR−989.326.250.870.09%69.3%
Proposed−988.896.761.30.1%66.8%

Original
AverageACNR2.1813.1%69.3%
Proposed0.692.40%66.5%

Original
MaximumACNR8.9758.7%73.4%
Proposed1.317.6%71.5%