Table 3.

Evaluation of CT number change with 80% noise reduction for all threshold‐based and bin‐based images

Energy Range (keV)	[25, 140]	[45, 140]	[65, 140]	[85, 140]	[25, 45]	[45, 65]	[65, 85]
CT # Change (HU)
Sample 1	0.1	−0.1	0.5	1.8	0.7	0.6	−1.2
Sample 2	0.7	1.2	0.2	0.9	1.9	−1.7	1.8
Sample 3	0.6	1.9	0.9	1.2	2.3	−1.6	2.4
Sample 4	0.6	0.8	0.5	2.0	1.9	0.1	−0.2
Sample 5	0.7	1.2	1.0	1.6	1.9	0.6	1.4
Sample 6	0.7	−0.1	0.5	0.6	2.0	0.7	−0.5
Sample 7	0.6	1.2	0.7	−0.3	1.3	0.5	1.9
Sample 8	0.0	0.3	0.8	2.3	−1.0	1.2	−1.0
Mean	0.5	0.8	0.6	1.3	1.4	0.1	0.6