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Doppler Ultrasound - Principles and practice

Doppler in Obstetrics: book by K Nicolaides, G Rizzo, K Hecher Chapter on Doppler Ultrasound : Principles and practice by Colin Deane INTRODUCTION Competent use of Doppler Ultrasound techniques requires an understanding of three key components: The capabilities and limitations of Doppler Ultrasound ; The different parameters which contribute to the flow display; Blood flow in arteries and veins. This chapter describes how these components contribute to the quality of Doppler Ultrasound images. Guidelines are given on how to obtain good images in all flow imaging modes. BASIC Principles Ultrasound images of flow, whether color flow or spectral Doppler , are essentially obtained from measurements of movement.

Doppler ultrasound measures the movement of the scatterers through the beam as a phase change in the received signal. The resulting Doppler frequency can be used to measure velocity if the beam/flow angle is known. Figure 3: Effect of the Doppler angle in the sonogram. (A) higher-frequency Doppler signal is obtained if the

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