Table 1 Technical specifications of the PET component for Vision 450 (Vision 600 within brackets) and Biograph mCT

Crystal dimension

3.2 × 3.2 × 20 mm³

4 × 4 × 20 mm³

Number of crystals per mini block

5 × 5

NA

Number of mini blocks per block

4 × 2

NA

Number of blocks per ring

38

48

Number of blocks in axial FOV

6 (8)

4

Axial FOV (cm)

19.7 (26.3)

21.6

Image planes

119 (159)

109

Plane spacing (mm)

1.65

2

Bed overlap for step and shoot mode (number of slices)

57 (79)

47

Maximum ring difference

59 (79)

49

Span

17

11

Coincidence time window (ns)

4.7

4.1

Energy window (keV)

435–585

435–650