This project on PET-MR imaging in oncology includes digital interactive software matching the cases in the book. Importantly, the interactive version of the atlas is based on the latest web standard, HTML5, ensuring compatibility with any computer operating system as well as with iPad, iPhone, and Android-based tablets. The book opens with two brief technical chapters on hybrid imaging principles and PET-MR technique, but consists primarily of illustrated clinical cases in different oncology domains. Each case study includes a short clinical history, findings, and teaching points, followed by illustrations, legends, and comments. The multimedia version of the book includes different types of movie that essentially comprise sequences of images that can be played either continuously or sequentially. The book is edited by three opinion leaders in the field, and individual chapters are co-authored by leading radiologists and nuclear medicine experts in the topic under discussion.