Intraoperative electron radiation therapy (IOERT) is an advanced technique that permits the precise delivery of radiotherapy for the treatment of cancer. IOERT complements the surgical procedure by providing an additional biological treatment margin, and can be used in the treatment of unresected cancer, residual neoplastic disease or tumor bed areas at high risk of recurrence. This atlas comprehensively documents the techniques involved in IOERT and the positive long-term results that can be achieved in patients with a variety of tumors, including head and neck, gastrointestinal and gynecological cancers, pediatric cancers, and sarcomas. The didactic, case solution approach, supplemented by many detailed and informative illustrations, serves to demonstrate the high value of IOERT in different contexts. This book will be invaluable to all specialists in cancer treatment, including surgeons.