X-ray tube with field effect emitter

An X-ray tube, comprising:

• a tube body enclosing a tube volume in a gas tight manner;
• an emitter electrode within the tube volume, the emitter electrode being an unheated electrode which having a plurality of emitter needles arranged on a substrate in a region facing a gate electrode;
• the gate electrode within the tube volume, the emitter electrode and the gate electrode are matched to one another such that applying an emission voltage between the emitter electrode and the gate electrode based on an electrical field formed as a result at tips of the emitter needles causes electrons to leave the emitter needles;
• and
• an anode within the tube volume, wherein the gate electrode includes,
• cutouts, below which one part of the emitter needles is arranged for each cutout, such that the electrons which leave the tips of the emitter needles below the respective cutout are to be accelerated through the cutouts onto the anode based on a high voltage applied between the emitter electrode and the anode,
• wherein the gate electrode is divided into a main region and a number of additional regions by insulating structures in the gate electrode,
• the emission voltage relative to the emitter electrode is applied to the main region,
• the additional regions are electrically conductively connected to the main region only by connecting bridges, and
• at least one cutout is in each of the additional regions.