ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Radiotherapy for brain cancer. Coloured computed tomography (CT) scan of the head of a patient being treated with radiotherapy for brain cancer. The patient is wearing a resin mask (yellow) over their head, which keeps the head completely still during treatment. Radiotherapy uses a beam of radiation to kill malignant (cancerous) cells.
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