Dosimetric Uncertainties in IMRT QA in Plastic Phantoms Due to CT Calibration
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F Buettner*1, E Spezi2, H Paganetti3, J Seco3,(1) Universitaet Heidelberg, Heidelberg, Baden-Wuerttemberg, DE, (2) Velindre Hospital, Cardiff , , GB, (3) Massachusetts General Hospital, Boston, MA, Mass General Hospital; Harvard Medical, Boston , MA