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Table 1 Characteristics of the Discovery MI and Discovery 690 scanners

From: Head-to-head comparison of a Si-photomultiplier-based and a conventional photomultiplier-based PET-CT system

PET/CT system Discovery MI Discovery PET/CT 690
Crystal material LYSO/LBS LYSO/LBS
Light detection SiPM PMT
Number of detector rings 4 3
Number of crystals 19584 13824
Size of crystals [mm3] 3.95 × 5.3 × 25 4.2 × 6.3 × 25
Slice thickness [mm] 2.79 3.27
Axial FOV [mm] 200 157
FOV [mm] 700 700
Overlap [%]a 23.9 23.4
NEMA Sensitivity [cps/kBq] 13.8 6.9
Image planes in the axial FOV 71 47
FWHM axial @1 cm [mm] 4.7 5.2
Coincidence window width (ns) 4.9 4.9
Coincidence timing resolution (ps) 375.4 544.3
Lower energy threshold (keV) 425 425
  1. aThe default overlap in the scanners. The overlap can be adjusted by the user