ESTRO course on Image Guided Radiotherapy in Clinical Practice 2018

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)

➢

Alignment of imaging and treatment isocenter

Precise alignment of imaging and treatment isocenter is

crucial in image-guided SRS