American Cancer Society: Radiation Therapy - The American Cancer Society is the nationwide community-based voluntary health organization dedicated to eliminating cancer as a major health problem by preventing cancer, saving lives, and diminishing suffering from cancer, through research, education, advocacy, and service.
Cancer.Net: Radiation Therapy - This is the patient information website of the American Society of Clinical Oncology (ASCO). It is designed to help patients and families make informed health-care decisions.
Also in Spanish.
Macmillan Cancer Support: Radiotherapy - This UK based organization helps with all the things that people affected by cancer want and need. The basics on cancer and radiation therapy can be found here.
MayoClinic: Radiation Therapy Treatment Planning - This slide show explains the treatment planning process that occurs before radiation therapy begins.
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MedlinePlus: Radiation Therapy - Developed by the National Library of Medicine, this consumer health site directs the user to selected online resources on many common diseases, conditions, and concerns.
Also in Spanish.
National Cancer Institute: Radiation Therapy and You Or Radiation Therapy to Treat Cancer - The NCI, established under the National Cancer Act of 1937, is the Federal Government's principal agency for cancer research and training.
OncoLink: Radiation OR Proton Therapy - OncoLink was founded in 1994 by Penn cancer specialists with a mission to help cancer patients, families, health care professionals and the general public get accurate cancer-related information. Several informative articles can be found here.
Radiology Info - This site was established to inform and educate the public about radiologic procedures and the role of radiologists in healthcare, and to improve communications between physicians and their patients.
Rutgers Cancer Institute of New Jersey: Radiation Oncology - The Department of Radiation Oncology at Rutgers Cancer Institute of New Jersey is committed to providing patients the information and support services they need to achieve the best possible treatment outcome. View available radiation oncology clinical trials from this site.
Interactive Tutorials / Videos
Health Library: Intensity Modulated Radiation Therapy (IMRT) - This is a 3D animation video by Nucleus Medical Media.