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Left pane: The Phase-II pCT head scanner installed in the research beam line at Loma Linda proton synchrotron. The front tracker (A), rear tracker (B), the phantom rotation stage (C), and 5-stage detector (D) are labeled. The red arrow indicates the proton beam direction. Right pane: the same scanner installed on a robotic arm in gantry room at Northwestern Medicine Chicago Proton Center.
