High-speed scan type x-ray generator
First Claim
1. A high-speed scan type X-ray generating apparatus for scanning X-ray generating positions along a circumference of an examinee, said apparatus comprising;
- a ring-shaped vacuum tube,at least one electron gun for emitting an accelerated electron beam into said vacuum tube,first deflecting means for causing said electron beam to run on a ring-shaped orbit through said vacuum tube, said first deflecting means including a pair of ring-shaped magnets oppose to each other across said vacuum tube for generating a magnetic field perpendicular to a plane formed by said ring-shaped vacuum tube;
second deflecting means for causing said electron beam to deviate from said ring-shaped orbit, said second deflecting means includes at least one pair of small electromagnets disposed in spaces between opposite pole faces of said ring-shaped magnets and said vacuum tube, for generating a magnetic field opposite to said magnetic field formed by said ring-shaped magnets, to cause said electron beam to deviate radially outwardly from said ring-shaped orbit; and
a target for generating X-rays toward center of said vacuum tube when said electron beam deviating from said ring-shaped orbit by said second deflecting means, impinges thereon, said target being a ring-shaped target having an inside peripheral wall for generating the X-rays toward the center of said vacuum tube;
wherein opposite pole faces of the pair of ring-shaped magnets constituting said first deflecting means are inclined to diverge from each other toward the center of said ring-shaped vacuum tube.
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Accused Products
Abstract
A high-speed scan type X-ray generating apparatus for scanning X-ray generating positions along a circumference of an examinee, in which an electron beam is emitted from an electron gun into a ring-shaped vacuum tube. The electron beam is deflected by electromagnets or the like to run on a circular orbit through the vacuum tube. The electron beam is further deflected by different, small electromagnets to deviate from the circular orbit and impinge on a ring-shaped target, thereby generating an X-ray toward the center of the vacuum tube. By controlling the small electromagnets, the X-ray generating position is caused to scan at high speed along a circumferential wall of the ring-shaped target.
44 Citations
5 Claims
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1. A high-speed scan type X-ray generating apparatus for scanning X-ray generating positions along a circumference of an examinee, said apparatus comprising;
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a ring-shaped vacuum tube, at least one electron gun for emitting an accelerated electron beam into said vacuum tube, first deflecting means for causing said electron beam to run on a ring-shaped orbit through said vacuum tube, said first deflecting means including a pair of ring-shaped magnets oppose to each other across said vacuum tube for generating a magnetic field perpendicular to a plane formed by said ring-shaped vacuum tube; second deflecting means for causing said electron beam to deviate from said ring-shaped orbit, said second deflecting means includes at least one pair of small electromagnets disposed in spaces between opposite pole faces of said ring-shaped magnets and said vacuum tube, for generating a magnetic field opposite to said magnetic field formed by said ring-shaped magnets, to cause said electron beam to deviate radially outwardly from said ring-shaped orbit; and a target for generating X-rays toward center of said vacuum tube when said electron beam deviating from said ring-shaped orbit by said second deflecting means, impinges thereon, said target being a ring-shaped target having an inside peripheral wall for generating the X-rays toward the center of said vacuum tube; wherein opposite pole faces of the pair of ring-shaped magnets constituting said first deflecting means are inclined to diverge from each other toward the center of said ring-shaped vacuum tube. - View Dependent Claims (3, 4, 5)
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2. A high-speed scan type X-ray generating apparatus for scanning X-ray generating positions along a circumference of an examinee, said apparatus comprising:
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a ring-shaped vacuum tube; at least one electron gun for emitting an accelerated electron beam into said vacuum tube; first deflecting means for causing said electron beam to run on a ring-shaped orbit through said vacuum tube, said first deflecting means includes a pair of ring-shaped magnets opposed to each other across said vacuum tube for generating a magnetic field perpendicular to a plane formed by said ring-shaped vacuum tube; second deflecting means for causing said electron beam to deviate from said ring-shaped orbit, said second deflecting means including at least one pair of small electromagnets opposed to one another across said radially of said vacuum tube for generating a magnetic field opposite to said magnetic field formed by said ring-shaped magnets, to cause said electron beam to deviate in a direction intersecting said plane formed by said vacuum tube; and a target for generating X-rays toward a center of said vacuum tube when said electron beam, after being deviated from said ring-shaped orbit to said second deflecting means, impinges thereon, said target is a ring-shaped target having a wedge-shaped section for generating the X-rays toward the center of said vacuum tube; wherein opposite pole faces of the pair of ring-shaped magnets constituting said first deflecting means are inclined to diverge from each other toward the center of said ring-shaped vacuum tube.
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Specification