The newly developed geometry for CT applications called WATCH allows a CT scan with variable resolution, in a lying as well as a sitting and standing patient position. It is an open system with easy access fort he radiologist and can be driven by a robot system. However, although the system and the used reconstruction should be very tolerant against movement errors, that would not be the case for geometrical misalignments. Therefore we focus on setting up the robot driven system with a 3D imaging detector and a calibration system. This calibration system can be used for standard CT as well.