A computed tomography system with an adjustable focal spot-to-detector
distance has a gantry provided with a patient opening, an x-ray tube and
a detector, respectively mounted at opposite sides of the gantry. The
x-ray tube has a focal spot and the x-ray fan beam radiated from the
focal spot exhibits a fixed aperture angle. The x-ray tube is installed
on a linear track and can be moved along the rail of the linear track.