BioMed Research International / 2013 / Article / Tab 1 / Research Article
Simultaneous Reduction in Noise and Cross-Contamination Artifacts for Dual-Energy X-Ray CT 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 ].
Dataset Basis material Algorithm Mean density (mg/cc) Standard deviation Absolute density error (mg/cc) % Density error % Noise reduction Case
4 ) Water Original 29.16 72.22 — — — ACNR 26.00 24.26 3.16 10.8% 66.4% Proposed 27.85 30.29 1.31 4.5% 58.1% Iodine Original −961.41 29.71 — — — ACNR −961.22 9.45 0.19 0.002% 68.2% Proposed −961.33 10.32 0.08 0.008% 65.3% Case
5 ) Water Original 15.28 88.27 — — — ACNR 24.25 27.99 8.97 58.7% 68.3% Proposed 15.42 28.17 0.14 0.9% 68.0% Iodine Original −967.92 31.42 — — — ACNR −967.41 9.83 0.51 0.05% 68.7% Proposed −966.31 10.98 0.61 0.2% 65.1% Case
Water Original 5.74 85.39 — — — ACNR 6.81 25.99 1.07 18.6% 69.6% Proposed 5.93 27.07 0.19 3.7% 68.3% Iodine Original −934.50 34.77 — — — ACNR −935.87 9.26 1.37 0.2% 73.2% Proposed −935.61 9.91 1.11 0.2% 71.5% Case
Water Original 9.42 45.94 — — — ACNR 7.48 15.89 1.94 20.6% 65.4% Proposed 8.70 16.57 0.72 7.6% 63.9% Iodine Original −993.72 12.84 — — — ACNR −994.56 3.41 0.84 0.08% 73.4% Proposed −994.25 3.94 0.53 0.05% 69.3% Case
Water Original 12.98 161.68 — — — ACNR 15.81 48.47 2.83 21.8% 70.0% Proposed 13.85 51.20 0.87 6.7% 68.3% Iodine Original −990.19 20.36 — — — ACNR −989.32 6.25 0.87 0.09% 69.3% Proposed −988.89 6.76 1.3 0.1% 66.8% Original — — — — — Average ACNR — — 2.18 13.1% 69.3% Proposed — — 0.69 2.40% 66.5% Original — — — — — Maximum ACNR — — 8.97 58.7% 73.4% Proposed — — 1.31 7.6% 71.5%
