Optimisation of CT protocols in PET-CT across different scanner models using different automatic exposure control methods and iterative reconstruction algorithms

EJNMMI Physics

Table 1 CT acquisition parameters used for the preliminary phantom experiment

	GE Discovery 710 (GE reference protocol)	Siemens Biograph mCT Flow
kV	140	140
AEC setting	Noise Index = 40	Quality Reference mAs varied
Collimation	64 × 0.625 mm	32 × 0.6 mm
Spiral pitch	1.375	1.35
Reconstructed slice thickness	2.5 mm	2 mm or 3 mm
Reconstructed field of view	500 mm	500 mm
Rotation time	0.5 s	0.5 s
Representative tube current	15 mA	Varied with Quality Reference mAs (range 20 to 47 mA)