Table 4.

Segmentation performance on bCT across different fibroglandular density categories.

Proportion of fibroglandular tissue in lesion neighborhood		$<20\%$		20% to 40%		$>40\%$
		$\mathrm{DICE}\pm \mathrm{std}$	Paired t-test $p$-value	$\mathrm{DICE}\pm \mathrm{std}$	Paired t-test $p$-value	$\mathrm{DICE}\pm \mathrm{std}$	Paired t-test $p$-value
Contrast-enhanced bCT	Previous model	$0.81\pm 0.08$	0.15 ($N=20$)	$0.78\pm 0.12$	0.57 ($N=15$)	$0.84\pm 0.01$	0.23 ($N=3$)
	Proposed model	$0.82\pm 0.06$		$0.77\pm 0.13$		$0.82\pm 0.01$
Noncontrast bCT	Previous model	$0.77\pm 0.09$	$\ll 0.05$ ($N=56$)	$0.77\pm 0.16$	0.01 ($N=55$)	$0.71\pm 0.15$	0.98 ($N=18$)
	Proposed model	$0.80\pm 0.08$		$0.79\pm 0.12$		$0.71\pm 0.14$