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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