Fig. 7

Sonographic images of transcranial pulsed Doppler examination of the basilar artery of canines showing pulsed Doppler mapping of the basilar artery obtained in the suboccipital window (longitudinal plane) of canines (A) pulsed spectrum showing normal morphology (B), pulsed spectrum with presence of dicrotic peaks, considered a variation of normality. 1 = Systolic peak; 2 = Dicrotic notch; 3 = Systolic point; 4 = Diastolic point