The 4th Edition of this text popularly known as the purple book returns with a comprehensive, up-to-date look at diagnostic imaging, presenting essential facts in an easy-to-read, bulleted format. More than 1,800 images highlight key diagnostic details and encompass the full range of modalities and specialties. A differential diagnosis section is found at the end of each chapter, and a differential index facilitates rapid reference. The 4th Edition includes coverage of new technologies, emphasizes clinical technical advances in CT and MRI, and examines the emergence of PET. A CD-ROM new to this edition features animations that depict the spatial and temporal complexities of MRI.