Blood volume per time measured in: cm³/s.
The sonographic detection of blood flow in vascular ultrasound is limited by factors such as tissue motion (clutter), attenuation properties of the intervening tissue, and slow or low-volume flow.

Different flow types in human body:

See also Antegrade, Bi-directional Flow, Velocity, Poiseulles Law, and Venous Ultrasound.

B-flow is an ultrasound imaging mode, which shows flowing blood as well as the vessel walls.

The flow rate describes the volume of fluid passing through a given vessel per time unit. The flow rate is measured in milliliters per second ml/sec or liters per minute l/min.

See also Poiseulles Law.

A flowmeter is a device to measure velocity or volume of flow of liquids or gases passing a given point per unit of time.

See also Time of Flight.

A flowprobe (or flowsensor) measures flow with a transducer by insonating vessels to calculate and depict volume flow of blood.