Since the last edition of this textbook, interventional radiation therapy (brachytherapy) has undergone significant developments. The incorporation of advanced image-guiding procedures and the establishment of new applicators allow for the highly accurate implantation of complex implants. 3D-guided real-time adaptive brachytherapy is becoming the newest clinical standard. We now find ourselves in an exciting "new era" of brachytherapy.The current edition of this textbook has been updated to include all these new developments in brachytherapy, including the results of recent clinical trials...