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Octavius and Angular Dependence
From PTW website: right: NKI-AVL and ieft: Van Esch A, Clermont C, Devillers M, Iori M, Huyskens DP. On-
line quality assurance of rotational radiotherapy treatment delivery by means of a 2D ion chamber array and
the Octavius phantom. Med Phys. 2007 Oct;34(10):3825-37.