TABLE 3.

Comparison of Full-Field Digital and Screen-Film Mammographic Techniques in Detecting Phantom Breast Masses of Various Shapes

Mass Shape	Imaging System	Sensitivity	Specificity	PPV	NPV	Accuracy	AUC	p
Round	FFDM	0.925	0.822	0.721	0.989	0.834	0.776	0.030
	SFM	0.940	0.687	0.564	0.990	0.717	0.629
Irregular	FFDM	0.811	0.829	0.697	0.971	0.828	0.596	< 0.001
	SFM	0.811	0.695	0.526	0.964	0.712	0.490

Note—For calculation of sensitivity, specificity, PPV, NPV, and accuracy, confidence level scores of 3, 4, and 5 were considered positive for each imaging system, and confidence level scores of 1 and 2 were considered negative for each imaging system. All p values were calculated based on the difference in AUC between the two mammographic systems using a paired-sample Student’s t test. PPV = positive predictive value, NPV = negative predictive value, AUC = area under the receiver operating characteristic curve, FFDM = full-field digital mammography, SFM = screen-film mammography.