This is the first publication providing a comprehensive guide to the testing and calibration of physiotherapy ultrasound machines with acoustic frequencies in the range of 0.5–5.0 MHz. It contains practical advice, examples and illustrations of acoustic calibration, presented within a framework of international standards and clinical practice. It revises and updates the information and advice contained in IPSM Report 58 and the Chartered Society of Physiotherapists Guidelines (1990). This new report from the Institute of Physics and Engineering in Medicine should be essential reading for physiotherapists, podiatrists, medical physicists, clinical technologists, electro and biomedical engineers, estates staff as well as manufacturers and suppliers of ultrasound equipment