Doppler Ultrasound - Introduction and Basic Theory
Overview
This lecture introduces Doppler ultrasound and the fundamental principles that underpin blood flow imaging and measurement. It explains how Doppler techniques are used to visualise circulation and assess blood flow in clinical practice, before introducing the key concepts of Continuous Wave (CW) Doppler, Pulsed Wave (PW) Doppler, the Doppler equation and aliasing.
Learning Outcomes
By the end of this lecture, you should be able to:
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Explain the Doppler effect and describe how it is applied in medical ultrasound to detect and measure blood flow.
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Describe the factors that influence Doppler frequency shift, including blood velocity, transmit frequency and beam-to-flow angle.
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Differentiate between Continuous Wave (CW) and Pulsed Wave (PW) Doppler, including their strengths and limitations in clinical practice.
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Explain the principles of Doppler signal acquisition and the relationship between Doppler frequency, velocity and the Doppler equation.
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Describe the causes and clinical significance of Doppler aliasing and identify methods used to reduce or avoid it.
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Recognise how Doppler ultrasound is used to image blood flow and support physiological measurement in a range of clinical applications.
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Explain how Pulse Repetition Frequency (PRF), depth and ultrasound frequency influence Doppler performance and measurement limits.
Lecture Details
- Duration: 35 minutes
- Series: Doppler Ultrasound and Blood Flow Measurement
- Provided by: Dr Colin Deane, King’s College London