MEDICAL IMAGING SYSTEM

The present invention relates to a medical imaging system (10), comprising: an X-ray source unit (20); an X-ray detector unit (30); a sensor unit (40); a reference structure (50); and a processing unit (60). The X-ray detector unit is configured to be placed relative to the X-ray source to acquire X-ray image data of a patient (P) positioned between the X-ray detector unit and the X-ray source unit. The reference structure is part of the X-ray detector unit or the reference structure is configured to be fixedly connected to the X-ray detector unit. An orientation of the sensor unit is known with respect to an orientation of the X-ray source unit. The sensor unit is configured to acquire a sensor image when the X-ray detector unit is placed relative to the X-ray source unit and the patient is positioned between the X-ray detector unit and the X-ray source unit, and wherein the sensor image comprises image data of the reference structure. The sensor unit is configured to provide the sensor image to the processing unit. The processing unit is configured to determine a position of the X-ray detector unit with respect to a position of the X-ray source unit, and wherein the determination comprises utilization of the orientation of the sensor unit with respect to the orientation of the X-ray source unit and the image data of the reference structure.