X-ray tube and a conditioning method thereof

An X-ray tube comprising:

• an electron emission unit comprising a cold cathode,
• wherein the electron emission unit is divided into a first region A and a second region B, and
• wherein the electron emission unit is formed in a square shape, and the first region A comprises a square in a center of the electron emission unit that it inclined at 45 degrees to edges of the emission unit, and the second region B comprises four corners of the electron emission unit surrounding the first region A;
• an anode unit comprising a target unit disposed opposite to the electron emission unit, with which electrons emitted from the electron emission unit collide;
• a focus structure disposed between the electron emission unit and the target unit disposed on a surface of the anode unit that is opposed to the electron emission unit;
• a first transistor TA connected to the first region A;
• a second transistor TB connected to the second region B;
• and
• a controller configured to turn ON/OFF the first region A and the second region B independently by selectively maintaining ON and OFF gate-cathode potentials in the first transistor TA and the second transistor TB respectively, and
• wherein collision regions at the anode unit of electron beams emitted from the first region A and the second region B substantially coincide with each other.