Doppler Ultrasound and Blood Flow Measurement

BMUS is pleased to provide this series of lectures on Doppler ultrasound and blood flow measurement to support the ongoing education and professional development of sonographers, radiologists and other healthcare professionals.

These resources build on the Ultrasound Physics and Equipment lecture series and are designed to strengthen understanding of how Doppler ultrasound is used in clinical practice to image blood flow, assess haemodynamics and perform vascular measurements. They help users optimise Doppler examinations, interpret flow waveforms, recognise common artefacts and understand the limitations of Doppler techniques.

We are grateful to Dr Colin Deane of King's College London for generously making these lectures available. Developed as part of the King's ultrasound education programme, they provide valuable insight into the scientific principles and clinical applications that underpin everyday Doppler ultrasound practice.

About this Lecture Series

This series provides an introduction to Doppler ultrasound and the measurement of blood flow, focusing on building a practical understanding of how movement and circulation can be visualised, assessed and quantified using ultrasound. The lectures explain the physical principles that underpin Doppler imaging while maintaining a clear emphasis on their application in clinical practice

While many resources cover Doppler ultrasound in depth, these lectures are specifically designed to support clinicians and ultrasound practitioners in understanding how Doppler systems work, how measurements are obtained, and how imaging parameters can be adjusted to optimise examinations. The emphasis is not on complex mathematical derivations, but on the principles users need to understand in order to acquire high-quality Doppler information and interpret it correctly.

The lectures place Doppler ultrasound firmly within the context of real clinical imaging, demonstrating how factors such as beam-flow angle, pulse repetition frequency, gain, colour flow settings and spectral Doppler controls influence image quality and measurement accuracy. Practical examples illustrate the use of Doppler ultrasound across vascular, abdominal, obstetric, gynaecological and transplant imaging.

As part of the wider King's ultrasound programme, learners are encouraged to explore the effects of different Doppler settings on their own equipment, assess flow waveforms and measurements, and develop a practical understanding of the strengths and limitations of Doppler imaging. This approach helps users apply the scientific principles directly to everyday clinical practice.

Lecture Series

Below is the full list of lectures included in this series. Each lecture includes video and accompanying slides.

1. Introduction and Basic Theory (35 minutes)

This lecture introduces Doppler ultrasound and the fundamental principles of blood flow imaging and measurement. It explains the Doppler effect, Continuous Wave (CW) Doppler, Pulsed Wave (PW) Doppler, the Doppler equation and aliasing, providing the theoretical foundation required to understand Doppler techniques in clinical ultrasound.

2. Colour Flow Imaging (35 minutes)

This lecture explores the practical use of Colour Flow Imaging (CFI). It covers colour assignment, scale (PRF), gain, focus, frame rate, beam steering and optimisation techniques, as well as power Doppler and common artefacts. The lecture demonstrates how colour Doppler can be used to visualise blood flow and guide further assessment.

3. PW Spectral Doppler (43 minutes)

This lecture focuses on Pulsed Wave spectral Doppler and the acquisition of Doppler measurements. It examines sample volume selection, beam steering, angle correction, waveform interpretation, velocity measurements, Doppler indices and common sources of error, helping users perform accurate haemodynamic assessments.

4. Blood Flow and Doppler Measurement (53 minutes)

This lecture explores the physiological principles underlying Doppler ultrasound measurements. Topics include flow and resistance, pulsatile flow, laminar and turbulent flow, flow waveforms, stenoses, pressure changes, Bernoulli's principle and venous haemodynamics. The lecture demonstrates how Doppler findings can be used to understand both normal physiology and vascular disease.