Table 2.

Key differences in the different parameters of the commonly used CT scanners

	Collimation	Pitch	Gantry rotation time (s)	Scan delay time (s)	Total scan time (s)
64 slice	64 × 0.625	0.6–1	0.75	4.2	7–9.4
128 slice	64 × 0.625	0.6–1	0.40	4.2	4–7
256 slice	128 × 0.625 × 2	0.6–1	0.33–0.4	4.2	3–6
Dual source FLASH	2 × 128 × 0.625	1–3.2	0.28	3–6.0	1.1–2