X-ray computed tomography system

An X-ray computed tomography system comprising:

• a reflection-type anode target for an X-ray source disposed in the form of an arc;
• a plurality of X-ray detectors disposed in such a manner as to face said anode target;
• an electron source for generating an electron beam for scanning said anode target in the form of an arc;
• first deflection means for deflecting a trajectory of said electron beam to an arc form trajectory in a plane inclusive of said anode target;
• second deflection means for causing said electron beam to scan said anode target in the form of an arc in said plane inclusive of said anode target, thereby causing X-rays to be generated by said anode target;
• and
• lens means for adjusting said electron beam;
• wherein said lens means adjusts a diameter and a focusing angle of said electron beam in accordance with an X-ray generation position on said anode target.

An X-ray computed tomography system comprising:

• a reflection-type anode target for an X-ray source disposed in the form of an arc;
• a plurality of X-ray detectors disposed in such a manner as to face said anode target;
• at least two electron sources for generating an electron beam for scanning said anode target in the form of an arc;
• deflection means for deflecting a trajectory of said electron beam to an arc form trajectory in a plane inclusive of said anode target and causing said electron beam to scan said anode target in the form of an arc in said plane inclusive of said anode target, thereby causing X-rays to be generated by said anode target;
• and
• lens means for adjusting a diameter and a focusing angle of said electron beam in accordance with an X-ray generation position on said anode target.

An X-ray computed tomography system comprising:

• a reflection-type anode target for an X-ray source disposed in the form of an arc;
• a plurality of X-ray detectors disposed in such a manner as to face said anode target;
• an electron source for generating an electron beam for scanning said anode target in the form of an arc;
• deflection means for deflecting a trajectory of said electron beam to an arc form trajectory in a plane inclusive of said anode target and causing said electron beam to scan said anode target in the form of an arc in said plane inclusive of said anode target, thereby causing X-rays to be generated by said anode target;
• and
• focusing means for focusing said electron beam when said electron beam is deflected to said arc form trajectory so as to provide a substantially constant diameter electron beam independent of position along said arc form trajectory.

A method of X-ray computed tomography comprising the steps of:

• adjusting a diameter and a focusing angle of an electron beam to desired values in accordance with a predetermined position on a reflection-type anode target for an X-ray source disposed in a plane when said electron beam is deflected in an arc in said plane and is irradiated to said anode target at said predetermined position, thereby causing X-rays to be generated by said anode target;
• irradiating the X-rays generated by said anode target to an object the image of which is to be taken;
• detecting the irradiated X-rays after transmission through said object;
• and
• imaging a section of said object based on the detected X-rays and displaying the resulting image.

An X-ray scanner for an X-ray computed tomography system, comprising:

• a reflection-type anode target for an X-ray source disposed in the form of an arc in a plane;
• an electron source disposed in the same plane as said anode target;
• means for scanning an electron beam from said electron source in an arc along said anode target, thereby causing X-rays to be generated by said anode target, said arc in which said electron beam is scanned being in said plane in which said anode target is disposed in the form of an arc;
• a plurality of X-ray detectors disposed in such a manner as to face said anode target;
• and
• lens means for adjusting a diameter and a focusing angle of said electron beam in accordance with an X-ray generation position on said anode target.