Table 1

Detailed information of CT perfusion (CTP) scan protocols

Center	1	2	3	4
Scanner	Toshiba Aquilion One*	Toshiba Aquilion One*	Siemens Somatom Definition Flash†	Siemens Somatom Definition Edge†
Kernel	FC26	FC26	H31s	H31s
No of patients	13	6	14	2
Brain coverage	160 mm	160 mm	100 mm	125 or 155 mm
Acquisition time	53 s (n=13)	53 s (n=5) or 50 s (n=1)	44 s (n=5) or 60 s (n=9)	53 s (n=1) or 60 s (n=1)
Contrast agent	Ultravist 270	Iomeprol 300	Ultravist 300	Iomeprol 400
Injection rate	5 mL/s	5 mL/s	7 mL/s	6 mL/s
Start of acquisition	5 s after injection	5 s after injection	2 s after injection	Immediately after injection