X-ray tube and a controller thereof

1. An X-ray tube comprising:

a vacuum vessel;

a cathode and an anode fixedly disposed inside the vacuum vessel;

a rotary mechanism comprising a rotary shaft that is configured to rotate the vacuum vessel,

wherein the cathode being disposed on a circumference with the rotary shaft as its center and including a plurality of cathode parts that can individually be turned ON/OFF, and

the anode including parts opposite to the plurality of cathode parts respectively;

a cathode switching circuit coupled to the cathode; and

a controller coupled to the cathode switching circuit and configured to intermittently or continuously select one of the plurality of cathode parts when in an absolute position as viewed from a coordinate system that is not rotated together with the vacuum vessel to generate an electron beam in a switching manner in sync with a rotation of the rotary shaft so that the anode generates X-rays from a fixed absolute position.

2. The X-ray tube according to claim 1 , wherein the anode is configured as a single disk-shaped member opposite to the cathode, and X-rays are generated from different parts of the anode as they are brought into the fixed absolute position.

3. The X-ray tube according to claim 1 , wherein the plurality of cathode parts are configured as mutually different members.

4. The X-ray tube according to claim 1 , wherein the cathode is configured as a single cathode array, and the plurality of cathode parts are mutually different parts of the single cathode array.

5. The X-ray tube according to claim 1 , further comprising an electrostatic deflection mechanism disposed between the cathode and the anode wherein the electrostatic deflection mechanism controls a path of an electron beam so that the electron beam generated by one of a plurality of cathode parts that is in a turned ON state collides with a specific position on the anode.

6. The X-ray tube of claim 1 , wherein the cathode switching circuit is configured to be rotated together with the vacuum vessel, and is connected to the plurality of cathode parts through wirings and selectively activates different cathode parts of the plurality of cathode parts as the different cathode parts of the plurality of cathode parts are rotated into the fixed absolute position.

7. The X-ray tube of claim 1 , wherein the cathode switching circuit comprises a plurality of terminals fixed respectively to the plurality of cathode parts and protruding from the vacuum vessel, and a fixed brush in an absolute position configured to selectively couple to a terminal of each cathode part of the plurality of cathode parts as each cathode part of the plurality of cathode parts is rotated into the fixed absolute position.

8. A system for controlling an X-ray tube,

wherein the X-ray tube comprises:

a vacuum vessel,

a cathode and an anode fixedly disposed inside the vacuum vessel,

a rotary mechanism comprising a rotary shaft that is configured to rotate the vacuum vessel,

wherein the cathode is disposed on a circumference with the rotary shaft at its center and comprises a plurality of cathode parts that are configured to be individually turned ON/OFF, and

the anode includes parts opposite to the plurality of cathode parts, respectively, and

a cathode switching circuit coupled to the cathode,

wherein the system comprises:

a controller coupled to the cathode switching circuit and configured to intermittently or continuously select one of the plurality of cathode parts when in an absolute position as viewed from a coordinate system that is not rotated together with the vacuum vessel to generate an electron beam in a switching manner in sync with a rotation of the rotary shaft so that X-rays are generated from a part of the parts of the anode opposite to the one of the plurality of cathode parts when the part of the parts of the anode is brought into a fixed absolute position.