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Principles of Blood Flow This section describes the simple principles of blood flow which are of value in understanding the role of Doppler and for performing vascular ultrasound examinations. The underlying principles of fluid mechanics applied to the flow of…

A number of techniques have been developed which exploit the shift in frequency of ultrasound when it is reflected from moving blood. This frequency shift is known as the ‘Doppler effect’. Five types of diagnostic Doppler instrument are usually distinguished:…