1 Introduction Christian Schiepers went major revisions. A few were updated and had CONTENTS only minor revisions (Chaps. 4, 7 and 15, ) and two 1. 1 Perspective 1 were left unchanged and re-printed from the first 1. 2 Objectives 2 edition. Our selection is aimed at elucidating key 1. 3 Clinical Overview 2 processes in cellular mechanisms of the human body, 1. 4 Basics of Diagnostic Nuclear Medicine 4 under normal conditions as well as in disease...