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. Author manuscript; available in PMC: 2013 Jul 7.
Published in final edited form as: Phys Med Biol. 2010 Apr 19;55(9):2761–2788. doi: 10.1088/0031-9155/55/9/022

Figure 4.

Figure 4

(a), (b) System NEC as a function of different time window and energy window centered at 511 keV for a 4 cm panel separation (the breast activity concentration of 7.4 kBq cm−3). The peak NEC rate reaches a plateau at ~131 kcts s−1 around a coincidence time window of ~6–8 ns and an energy window of 10% at 511 keV. (c) Comparison of NEC performance among three system configurations.