Principle

This set-up shows how blood flow studies are performed using Doppler ultrasound (Doppler sonograph). On a realistic arm dummy, the differences between continuous (venous) and pulsating (arterial) flow are shown as well as the difference in flow through a normal blood vessel and a stenosis.

Benefits

• Ideal experiment for medical students to learn the principles of Doppler sonography
• True to life with an arm model with blood vessels and stenosis
• Experiment components can also be used for other experiments relevant for medical students 
• Display of measurement values as with a diagnostic system

Tasks

1. Analyse blood flow and search positive and negative flow components. Explain the differences.
2. Locate the built-in stenosis and compare the spectral distribution upstream and downstream of the stenosis.
3. Examine and compare the three pulse modes of the pump.

Learning objectives

• Venous flow
• Arterial flow
• Stenosis
• Blood flow velocity tracings
• Frequency shift
• Doppler effect
• Doppler angle
• Doppler sonography
• Colour Doppler
• Continuity equation