Book excerpt: Fundamentals of Radiation Oncology: Physical, Biological, and Clinical Aspects, Fourth Edition, is written by a team of renowned experts. This book is a must-have resource for anyone practicing radiation oncology. From basic principles to more-advanced planning and delivery of radiation therapy to treat cancer, this book is a go-to resource for mastering the art and science of radiation oncology. - Recent advances in SRS, SBRT, proton therapy, an immunotherapy - New chapters on adaptive radiotherapy, and artificial intelligence in radiation therapy - IMRT and IGRT techniques are covered in depth in all clinical chapters - Latest landmark studies provide evidence-based rationale for recommended treatments - Radiation treatment toxicity and its management