One of the treatment options for recurrent brain metastases is surgical resection combined with intracranial brachytherapy. GammaTile® (GT) (GT Medical Technologies, Tempe, Arizona) is a tile-shaped permanent brachytherapy device with cesium 131 ( 131 Cs) seeds embedded within a collagen carrier. We report a case of treating a patient with recurrent brain metastases with GT and demonstrate a dosimetric modeling method.

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Radiation therapy is an important cancer treatment. At least half of the cancer patients in the United States receive radiation therapy every year. X-rays are often used in radiation therapy. How are X-rays produced? How do we use X-rays to treat cancer? This article answers these questions and explains the physics behind radiation therapy.