Effect of Different Breast Densities and Average Glandular Dose on Contrast to Noise Ratios in Full-Field Digital Mammography: Simulation and Phantom Study

Table 3

Mean CNR for each mammary gland tissue ratio adjusted by the AGD as a covariate.

Breast phantom model (Fibroglandular/adipose ratio)	CNR	Unadjusted difference [95%CI]	p	CNR	Adjusted for AGD difference [95%CI]	p
A (30/70)	15.73	-1.3	0.6274	16.14	-0.92	0.1459
B (50/50)	14.43	[-6.84, 4.24]		15.22	[-2.23, 0.39]
C (70/30)	15.73	-2.17	0.4217	16.14	-2.66	0.0017
A (30/70)	13.57	[-7.7, 3.37]		13.48	[-4.03, -1.29]
B (50/50)	14.43	-0.87	0.7465	15.22	-1.74	0.0006
C (70/30)	13.57	[-6.4, 4.67]		13.48	[-2.5, -0.98]