This book provides a comprehensive and up-to-date overview of major technical advances and research findings in the field of brachytherapy. Especially research conducted on brachytherapy in Japan has made tremendous strides, offering readers valuable insights into new treatment outcomes, evidence and techniques. In the respective chapters, each author elucidates cutting-edge findings, addressing both the basic and clinical aspects including the application to various cancers, and especially focusing on highly valuable data gleaned in Japan. As such, the book will benefit not only radiation oncologists but also basic researchers, radiation technologists, medical physicists and members of medical staff who are involved in the development and utilization of this advanced therapy.