Volume flow rate

Vascular imaging of carotid and vertebral arteries may not be sufficient to evaluate the patients with stroke and other cerebrovascular disorders. Cerebral blood flow measurement can add information to increase the accuracy in diagnosis, assessment, and plan of management in these patients. There are many noninvasive quantitative methods to measure cerebral blood flow including volume flow rate measured by ultrasound. This article addresses mainly the different ultrasound techniques to measure cerebral blood flow. Clinical applications, volume flow rate in normal and abnormal conditions with a case example, and advantage and disadvantage of the ultrasound techniques are also described.