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

Table 5

Predictive formulae for CNR according to breast density.

Breast phantom model (Fibroglandular/adipose ratio)	Correlation with CNR		CNR predictive formula	R^2	RMSE
	r	p
A (30/70)	-0.9631		CNR = -8.69AGD+26.12	0.928	1.323
B (50/50)	-0.9724		CNR = -14.62AGD+30.80	0.946	1.314
C (70/30)	-0.9126		CNR = -11.2AGD+26.64	0.833	2.301

Model: p < 0.0001, R² = 0.865, and RMSE = 1.893. CNR: contrast to noise ratio and RMSE: root mean square error.