Figure 4From: Turbulent flow as a cause for underestimating coronary flow reserve measured by Doppler guide wireFlow profile under laminar and turbulent conditions: Under laminar flow the average peak velocity divided by 2 (APV/2) multiplied with the lamina area (vessel diameter = d) can be used for exact quantitative measurement of the blood flow. Under turbulent flow an underestimation of the blood flow occurs when measured with a Doppler wire.Back to article page