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CURRENT Diagnosis & Treatment in Otolaryngology—Head & Neck Surgery, 3e
Chapter 4. Principles of Radiation Oncology
Sections: Introduction, Radiobiology, Pretreatment Requisites, Treatment Selection, Sequelae of Radiation Therapy.
Topics Discussed: head and neck cancer; radiation oncology.
Excerpt:"Radiation oncology is the discipline of medicine involving the use of ionizing radiation to treat malignant neoplasias. The radiation oncologist aims to deliver a precise dose of ionizing radiation to a defined tumor volume while minimizing damage to the surrounding normal structures. Due to the increasingly multidisciplinary nature of oncology, an understanding of radiation therapy is crucial to the surgeon involved in the combined-modality treatment of the patient with head and neck cancer.Therapeutic ionizing radiation can be divided into two categories: high-frequency electromagnetic radiation (X-rays and  -rays) and particulate radiation (electrons, neutrons, protons). The amount of radiation absorbed per unit mass of tissue is known as the absorbed dose. The most commonly used unit for absorbed dose is the gray (Gy), which is equivalent to one joule of energy absorbed per kilogram of tissue. One Gy is also equal to 100 cGy, or 100 rads (the previously used unit of absorbed dose)...."
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