The updated edition of the first of three volumes on Medical Physics focuses even more on body systems related to physical principles such as body mechanics, energy balance, and action potentials. Thanks to numerous newly incorporated didactic features, the introductory text into the broad fi eld of medical physics is easy to understand and supports self-study. New: highlighted boxes emphasize special topics; math boxes explain more advanced mathematical issues; each chapter concludes with a summary of the key concepts, questions, a self-assessment of the acquired competence, and exercises. The appendix contains answers to questions and solutions to exercises.