What is the approximate velocity described for the terminal internal carotid artery in this data?

• A. 55 cm/s
• B. 21 cm/s
• C. 39 cm/s
• D. 47 cm/s

Answer: (A)

Vessel velocity in the terminal internal carotid artery typically falls in the tens of centimeters per second range, reflecting intracranial flow where resistance is higher and the vessel narrows downstream. In normal intracranial segments, peak systolic velocities are often around the mid-50s cm/s. If the data describe an approximate velocity near 55 cm/s for the terminal ICA, that aligns well with the expected intracranial range and best matches the measurement shown. Velocities much lower, like around 21 cm/s, would be unusual for this segment in a normal study, while values around 39 or 47 cm/s are plausible but not as close to the reported value as 55 cm/s.