Table III.

Coefficients of the third-order polynomial fit of the polyenergetic $R{D}_g{N}^{\mathit{CT}}\left(y\right)$ of the form $R{D}_g{N}^{\mathit{CT}}\left(y\right)=1-ay-b{y}^2+c{y}^3$ determined with a 49 kVp x-ray spectrum (1st HVL: 1.389 mm of Al). The fit corresponds to Fig. 10.

	Fit parameters
Breast diameter (cm)	a	b	c	$\mathrm{adjusted}{r}^2$
Geometry A
10	$0.05839$	$0.00124$	$8.46246\times {10}^{-5}$	0.99996
14	$0.03991$	$6.78237\times {10}^{-4}$	$3.06939\times {10}^{-5}$	0.9999
18	$0.03068$	$3.72287\times {10}^{-4}$	$1.31811\times {10}^{-5}$	0.99995
Geometry B
10	$0.08357$	$0.00246$	$2.39446\times {10}^{-4}$	0.99989
14	$0.05722$	$0.00133$	$8.50915\times {10}^{-5}$	0.99994
18	$0.04391$	$7.54892\times {10}^{-4}$	$3.72787\times {10}^{-5}$	0.99994