External-beam radiation therapy (EBRT) is a treatment where radiation beams come from a source outside the body. Usually, it comes from a machine called a linear accelerator (also called a LINAC).

Prior to 1896, no one had ever had an X-ray picture taken of a body part. This now-ubiquitous diagnostic tool that lets us see deep inside the body simply hadn’t been invented yet. But just 121 years ...

Healthcare professionals use external beam radiation therapy (EBRT) to treat many types of cancer. They also use it to treat some noncancerous tumors and other conditions. Radiation therapy involves ...