2017_IGRT course book

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)

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