Table 2. Determination results of rabbit carotid artery by color Doppler ultrasound.

Test items (n = 8)	test results by color Doppler ultrasound, Left carotid artery	test results by color Doppler ultrasound, right carotid artery
The vessel diameter	2.31±0.15	2.28±0.21*
The peak systolic velocity (PSV)	46.52±11.45	49.13±13.08*
end diastolic velocity (EDV)	9.60±1.42	9.54±1.41*
resistance index (RI)	4.79±1.47	5.16±1.21*
systolic and diastolic flow velocity ratio (s/d)	0.79±0.04	0.79±0.05*
pressure gradient (PG)	1.13±0.35	1.25±0.46*

^* P>0.05 compared with the Left carotid artery.