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Venous Plethysmography

Measurement of Blood Flow

V F Murphy< a> Saturday 24th May 2003

Continuous wave ultrasound Continuous wave ultrasound probe techniques involve an ultrasound signal being transmitted into the skin, and the difference in frequency reflected being measured. Along with the spectral broadening, this provides an indication of blood flow in terms of turbulence and presence. It however is difficult to get a qualitative measure, to discriminate between venous, capillary, or arterial vessels, is sensitive to the angle to flow, and lacks depth resolution. On the posit…

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