Fig. 5

Transcranial sonographic images from the color Doppler study of the middle cerebral artery (MCA) and basilar artery (BA) of young, adult and elderly dogs. (A) and (B) MCA (arrow) and BA (blue flow) of puppies. (C) and (D) MCA (arrow) and BA of an elderly dog. Doppler adjustments (A) Color Doppler gain = 65% and PRF = 1.9 kHz; (B) Color Doppler gain = 66%; PRF = 3.5 kHz; (C) Color Doppler gain = 60%, PRF = 1.5 KHZ; (D) Color Doppler gain = 60%; PRF = 1.5 KHz