Table 1.

CT acquisition protocol parameters

Scanner	Rotation time (s)	Collimation	Table feed (mm/s)	Slice thickness (mm)	Slice interval (mm)	Duration (s)
4 slice	0.5	4 × 1 mm	25	1.25	1	25-30
16 slice	0.5	16 × 0.625 mm	27.5	0.625	0.625	25-30
64 slice	0.5	64 ×0.625 mm	80	0.625	0.625	<15