Table 2.

The direct comparison of the average calcification CNR of the two smallest calcification (250–280 and 300–355 μm) sizes in the standard and processed DE calcification images and the gain in the calcification CNR (the ratio of the slope of the average CNR of the processed DE image relative to the slope of the average CNR of the standard DE image) for the processed DE calcification images. The CNR and gain values associated with the standard LE image are also shown for comparison.

Noise reduction technique		CNR gain	CNR 300–355 μm	CNR 280–300 μm
	DE standard	1	2	1.5
	LE standard	11.3	22.9	14.6
	Boxcar
	Kernel = 3	2.3	3.2	1.9
	5	3.4	3.2	1.3
	7	4.0	2.3	0.9
	HE median
	Kernel = 3	1.4	5.2	4.1
	5	1.9	7.0	4.3
	7	2.0	3.9	3.1
	KNR
Scale = S	Kernel = 5	3.4	5.3	3.0
S	11	5.6	8.2	5.5
S	25	7.8	14.6	9.0
S	51	10.1	19.9	11.2
0.50 S	Kernel = 51	1.6	3.5	2.7
0.75 S	51	2.7	6.0	4.6
S	51	10.1	19.9	11.2
1.25 S	51	2.0	4.1	2.8
1.5 S	51	0.8	1.8	1.2