Book excerpt: "The purple book," gives you a comprehensive, up-to-date look at diagnostic imaging in an easy-to-read, bulleted format. Drs. Ralph Weissleder, Jack Wittenberg, Mukesh Harisinghani, and John W. Chen combine detailed illustrations and images with guidance on the latest applications of PET, CTA, and MRA into a portable resource for convenient reference wherever you go. Master the latest technologies, including hybrid PET, CTA, and MRA, through updated and expanded coverage of imaging modalities and their applications.