An X-ray tube is disclosed. The X-ray tube can include a cathode configured to emit electrons, an anode that has a surface arranged parallel to an emission direction of the electrons and is configured to collide with the electrons and emit X-rays, and a guide positioned between the cathode and the anode to modify the direction in which the electrons travel such that the electrons collide with the surface of the anode. The X-ray tube according to an embodiment of the invention can be used to improve the unevenness in X-ray intensity.