This comprehensive resource provides clear explanations and numerous, simple line drawings that fully explain the whys of physics as applied to ultrasound. Updated content includes new material on PACS, contrast agents, power Doppler, harmonic imaging, 3D and 4D technology, 1.5D and 2D transducers, spatial compounding, extended field of view, and composite material transducers. Material is clarified through the use of well-designed analogies, examples of digitally processed images, and learning features such as key terms, clinical examples, end-of-chapter review questions, mock registery exams, a glossary, and a math review appendix. This text also offers excellent preparation for the physics portion of the ARDMS certification exam.