Effect of Different Breast Densities and Average Glandular Dose on Contrast to Noise Ratios in Full-Field Digital Mammography: Simulation and Phantom Study
Table 8
Results of multivariate linear regression analysis using CNR as the objective variable and phantom type and AGD as the explanatory variables.
Regression results
Analysis of variance
Variable
Level
Regression coefficient
Lower limit of 95% confidence interval
Upper limit of 95% confidence interval
Wald test p value
Contribution rate
Chi-squared test p value
Constant term
-
28.668
25.607
31.729
3.647.E-13
-
-
Phantom type
B
-2.119
-4.262
0.024
5.230.E-02
3.63%
1.305.E-01
Phantom type
C
-2.559
-4.697
-0.421
2.178.E-02
-
-
AGD
-
-10.822
-13.048
-8.595
1.070.E-08
82.96%
1.070.E-08
AIC: 99.99013, AGD: average glandular dose, and CNR: contrast to noise ratio, Akaike's Information Criterion.