1. A method for generating an image sequence for a 3D reconstruction by means of an x-ray image recording system with an x-ray C-arm, comprising: providing an x-ray source and an x-ray detector supported by the C-arm; receiving an entry for determining an envelope in coordinates defined at the x-ray image recording system; receiving an entry for determining a point in a region of interest; calculating a plurality of positions of the x-ray C-arm, wherein the flat panel detector is at right angles in each instance to a straight line which emanates from the point in the region of interest and touches the envelope tangentially; passing through the positions calculated by moving the x-ray C-arm; and automatically recording an x-ray image with each position respectively.