The present invention provides medical imaging system comprising a guidance means for guiding a carriage along the longitudinal direction of a patient couch, and an imaging ring system with a carriage ring fixed to the carriage, a first rotatable ring carrying a first imaging unit, and a second rotatable ring carrying a second imaging unit, wherein the first and second rotatable rings are configured to be rotated independently from each other on the carriage ring. Preferably, the first imaging unit is a radiation source and the second imaging unit is a radiation detector. The invention further provides a preferably mounted patient positioning system for use in a medical intervention, comprising a robotic arm having six axes, and a patient couch wherein the couch is fixed to the robotic arm via a C-shaped bow.
