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Doppler ultrasound examination in dogs and cats 1. The principles

THIS is the first of three articles about Doppler ultrasound and its role in the investigation of diseases in dogs and cats. For small animal practitioners already familiar with two-dimensional, grey-scale ultrasonography, Doppler ultrasound represents the next level of sophistication, and is a more technically demanding modality. These articles aim to provide a basis for an understanding of the techniques and to assist in case selection, both for practitioners wishing to perform these studies and those requesting examinations by specialists. This first article describes the Doppler principle and the different types of Doppler techniques that are used for diagnosis. The second and third articles, to be published in the May and June issues, will discuss the applications of Doppler ultrasound in the abdomen and in the assessment of cardiac diseases, respectively.

Chris Lamb is Senior Lecturer in radiology in the Department of Veterinary Clinical Sciences at The Royal Veterinary College (RVC). He is a diplomate of both the American College of Veterinary Radiology and the European College of Veterinary Diagnostic Imaging.

Adrian Boswood is Senior Lecturer in internal medicine in the Department of Veterinary Clinical Sciences at The RVC. He is an RCVS specialist in veterinary cardiology and holds the European College of Veterinary Internal Medicine's cardiology diploma. His main area of interest is small animal cardiorespiratory medicine.