An X-ray tube system comprising: at least one filament adapted to produce two electron beams when electrified; at least two anodes spaced from each other along a first direction that each comprises a face that receives an electron beams from the at least one filament at a focal point and produces x-ray cone beams responsive thereto, the x-ray beams being directed in a same direction perpendicular to the first direction; a collimator that collimates the cone beams such that the beams are asymmetric, with the side of each beam distal from the other beam having a smaller beam angle than the side proximal to the other beam.