S432 ESTRO 35 2016 ______________________________________________________________________________________________________ include poor visibility of the small bowel on the CBCTs, smaller field of view meaning less volume and variation between initial planning clinician and clinician outlining CBCTs. CBCT is now widely used for adaptive planning techniques and in this case has provided evidence for implementing a stricter bladder filling protocol to improve the accuracy of bowel dose statistics

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... t planning. Purpose or Objective: We report the results of our investigation into whole brain radiotherapy using linear accelerator-based intensity-modulated radiation therapy and volumetric-modulated arc therapy in cancer patients with a high risk of metastasis to the brain. Concretely, we assessed the absorbed dose and the rate of adverse effects for several organs at risk according to the tilt of a patient's head.