Patent ID: 7568837

Claim:
A method for activating an x-ray image recording system with an x-ray C-arm, comprising: positioning the x-ray C-arm to a first position; recording a first 2D x-ray image of a patient in the first position; positioning the x-ray C-arm to a second position; recording a second 2D x-ray image of the patient in the second position; defining a first 2D axis line in relation to an object of the patient in a first coordinate of the first 2D x-ray image; defining a second 2D axis line in relation to the object in a second coordinate of the second 2D x-ray image; back-projecting the first and the second 2D axis line into a volume element space; determining a 3D axis line in the volume element space from the back-projected first and second 2D axis line; and activating the x-ray image recording system by pivoting the x-ray C-arm about the 3D axis line.