ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Brain tumour radiotherapy treatment. The patient is wearing a custom-made rigid mask (dots) to hold their head in position during treatment. Guide lasers (blue lines) are also used to help plan and target the radiotherapy so that the radiation is focused on precisely the same site in each treatment session. Here, the patient is inside the tunnel of the radiotherapy machine.
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