IGRT 2016 Madrid

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Alignment of imaging and treatment isocenter

Precise alignment of imaging and treatment isocenter is crucial in image-guided SRS

Ball bearing phantom: 1. Phantom is positioned in the MV-treatment isocenter 2. Distance or phantom to imaging isocenter is measured Accuracies of < 1mm are usually specified  Alignment stable over time (Wiehle et al. 2009)  Verification prior to each single fraction radiosurgery

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