This updated fourth edition provides current information on devices and is divided into diagnostic and treatment sections. Devices are described with the theory of operation and relevant anatomical and physiological considerations. Aspects of BMET work including test equipment, standards, and information technology are also discussed. The text covers a wide variety of diagnostic and treatment devices currently used in hospitals that students will likely encounter in their career. Principles of operation and examples of use are provided. This book is unique in that it is written by an experienced biomed tech with 30 years’ experience in hospitals rather than by engineers with little frontline experience. It is also unique in that it provides ancillary materials on the web and is the only guide divided into diagnostic and treatment device sections. This new edition also includes two new chapters on computers, information technology, and networking as well as health technology management.