TABLE 4

NECR Values from Patient Scans

	Breast no.^*
Parameter	1A	1U	2A	2U	3A	4A	4U
Normalized injection activity (MBq)	196	157	324	270	382	118	145
Singles (kcps)^†	296	207	492	412	536	195	232
NECR (k = 1) (cps)	1,474	793	154	145	107	400	503
NECR (k = 2) (cps)	1,247	668	94	89	61	323	401
Scatter fraction (%)	30	21	15	10	17	25	25
Breast volume in PET FOV (cm³)	1,077	532	204	185	391	965	1,001

↵* Patient number, followed by breast scanned: affected (A) or unaffected (U).
↵† Dead-time–corrected, energy-windowed (350–650 keV), and energy-averaged over projections and detector heads.
Detector separation was 20.6 cm for patients 1 and 2 and 26.3 cm for patients 3 and 4.