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What happens during radiation therapy for brain tumors?

Tania B. Kaprealian, MD
Radiation Oncology
During radiation therapy for brain tumors, the radiation machine rotates around the person and takes various x-rays. These are matched to the computed tomography (CT) scan that was done for planning. The doctor has to make sure that the set up is correct before treatment can proceed. Once the doctor has approved the various images, the treatment begins. 

The treatment focuses intently on the tumor region, and it delivers the dose. Each time the radiation beam changes angles, new images have to be taken, and it has to be confirmed that they match again. Then, the treatment continues. Both the machine and the table that the person is on can move, allowing doctors to deliver the best conformal (tumor shape-hugging) plan.

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