470-471 / 3581
Jeung et al, ESTRO 2010
IsoCal, Varian Medical
Systems
kV, gantry-mounted: Isocenter calibration
example of calibration tool
•16 BBs, 4mm, should
overlap when imaged
• Collimator insert, with a
pin to determine MV
central axis
•Automatic imager
correction while the gantry
is turning
•About 15 min for
calibration procedure