X-ray tube and X-ray imaging system

The utility model discloses an X-ray tube and an X-ray imaging system, the X-ray tube comprises a cathode and an anode, the cathode comprises a first focusing groove, a second focusing groove arranged at the bottom of the first focusing groove, and a cathode filament partially arranged in the second focusing groove, the anode comprises a heat dissipation piece and an anode target arranged on the heat dissipation piece, the anode target and the first focusing groove are oppositely arranged, the X-ray tube is further provided with a virtual focusing shaft penetrating through the anode target, and when the X-ray tube is in a working state, the virtual focusing shaft penetrates through the anode target. And an electron beam emitted by the cathode moves towards the anode along a straight line where the focusing shaft is located, so that the electron beam collides with the anode target. According to the X-ray tube and the X-ray imaging system provided by the utility model, a small focus can be obtained without redu