Device for determining the position of at least one medical instrument with a position sensor system inserted into the body of a patient for an examination using imaging examination equipment, in particular X-ray equipment, wherein the device has a computing unit, in which at least one piece of examination equipment specific information limiting the possible spatial positions of the medical instrument during the examination is stored, wherein the computing unit is designed to determine the position in a limited position area of the possible spatial positions and according to the limiting examination equipment specific information.
