Procedure for generating fluoroscopic images for the reconstruction of a volume in a flat object using an X-ray system

A procedure for generating fluoroscopic images for reconstruction of a volume in a flat object using an X-ray system, which has three imaging components, a tube, a detector, and an object holder, located between them, on which the flat object is fixed,

• wherein the flat object extends multiple times further in two dimensions—called surface area—than in its third dimension—called thickness—wherein the tube has a focus, which, in a central position of the tube, forms a coordinate origin of a Cartesian coordinate system, and which emits an X-ray, wherein a vector from the tube through the volume forms the an axis of the coordinate system and a z axis is perpendicular to a vector formed through the thickness,
• wherein a position and orientation of the tube and the detector relative to each other always remain the same and the combination of the tube and the detector is referred to as an imaging system,
• wherein the imaging system is rotated about an axis of rotation, which is perpendicular to the x axis, runs parallel to the z axis and is displaceable parallel to the x axis,
• wherein the axis of rotation extends through the volume each time a fluoroscopic image is generated,
• wherein a distance between the tube and the axis of rotation is altered such that when the imaging system is rotated about the axis of rotation, the flat object has as small as possible a distance to the tube at every angle of rotation (Θ), wherein the distance does not fall below a definable minimum distance,
• wherein fluoroscopic images are made at predefinable angles of rotation (Θ) and angle increments (dr°) between neighbouring predefinable angles of rotation (Θ) are larger in case of smaller distances of the axis of rotation from the tube than in case of larger distances of the axis of rotation from the tube.