TABLE 4. Average Sensitivity from Three Blinded Reviews of Single-Head and Dual-Head Molecular Breast Imaging as a Function of the Location of the Tumor Within the Breast.

		Single Head			Dual Heads
Tumor Location	No. of Tumors	TP	FN	Sensitivity (%)	TP	FN	Sensitivity (%)	No. of Additional Tumors Detected with Dual Heads vs. Single Head Only
Upper outer quadrant	48	41	7	85	45	3	94	4
Upper inner quadrant	23	17	6	74	21	2	91	4
Lower outer quadrant	15	12	3	80	13	2	87	1
Lower inner quadrant	4	2	2	50	2	2	50	0
Superior midline	9	6	3	67	7	2	78	1
Inferior midline	7	6	1	86	7	0	100	1
Medial midline	3	3	0	100	3	0	100	0
Lateral midline	11	9	2	82	10	1	91	1
Subareolar and periareolar	8	6	2	75	7	1	88	1
Total	128	102	26	80	115	13	90	13

Note—With single-head molecular breast imaging, detector 1 was used to image the inferior (in craniocaudal [CC] view) and lateral (in mediolateral oblique [MLO] view) aspects of the breast. With dual-head molecular breast imaging, detector 2 was used in addition to detector 1 to also image the superior (in CC view) and medial (in MLO) view of the breast. TP = true-positive, FN = false-negative.