This document, which is a Technical Specification, describes methods meant to assist users of ultrasound physiotherapy systems in checking the performance of such systems. It is applicable primarily to physiotherapists, general medical practitioners, chiropractors, osteopaths, beauty therapists, sports professionals, biomedical engineers, medical physicists, medical device service agents, commercial testers, test houses or manufacturers. Typical ultrasound physiotherapy systems operate in the range from 0,5 MHz to 5 MHz. Long-wave ultrasound therapy machines operating in the frequency range 30 kHz to 0,5 MHz are not covered by this document.