ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Radiotherapy for brain cancer. Coloured computed tomography (CT) scan of an axial section through the head of a patient being treated with radiotherapy for brain cancer (orange). The patient is wearing a resin mask (outlined by brown dotted line) 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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