Table 1.

Summary of CT hardware and parameters for state-of-the-art CT scanners from the major CT manufacturers

Scanner	X-ray sources, number	Detector rows, number	Detector-row x-axis dimension, mm*	Total nominal beam width, mm	Fastest gantry rotation time, s	Temporal resolution for each cross-sectional image, s†
GE Discovery CT750 HD	1	64	0.625	40	0.35	0.175
Hitachi SCENARIA	1	64	0.625	40	0.35	0.175
Phillips Brilliance iCT	1	128‡	0.625	80	0.27	0.135
Siemens SOMATOM Definition FLASH	2 (95° apart)	64‡	0.6	40	0.28	0.075
Toshiba Aquilion ONE	1	320	0.5	160	0.35	0.175

^*Values measured at scanner isocenter;

^†Values do not reflect the use of multi-segment reconstruction;

^‡Uses z-axis flying focal spot to sample each detector twice per rotation.