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. 2015 May 8;10(5):e0126152. doi: 10.1371/journal.pone.0126152

Fig 1. The Vero4DRT system with dual implementation of the kV imaging system and electronic portal imaging device (EPID).

Fig 1

Exposure by non-coplanar MV beams was enabled by gantry and ring rotation. Dynamic tumor motion tracking was conducted through exposure to the gimbaled MV X-ray head. The lock-on system was used to correct sagging by the X-ray beam axis.