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Apparatus for obtaining an X-ray image
| Details |
Inventors: Watanabe, Eiji;
Assignee: Nihon Denshi Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Smith; Alfred E.
Assistant Examiner: Grigsby; T. N.
Attorney, Agent or Firm: Webb, Burden, Robinson & Webb
A computed tomography apparatus in which a fan-shaped X-ray beam is caused to pass through a section of an object, enabling absorption detection on the opposite side of the object by a detector comprising a plurality of discrete detector elements. An electron beam generating the X-ray beam by impacting upon a target is caused to rotate over the target. |
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DETAILED DESCRIPTION Having thus described my invention with the detail and particularity as required by the Patent Laws, what is desired protected by Letters Patent is set forth in the following claims.
1.
An apparatus for obtaining a two dimensional image of an X-ray absorption distribution on a cross-sectional plane of an object comprising: a.
a source for generating an electron beam, b.
a target, in part annular, for generating a fan-shaped X-ray beam, the angle of the fan being sufficient to cover the entire region of interest in said object, said target being fixed with respect to said object, c.
means for focusing said electron beam on said target, d.
means for rotating said electron beam around the target so as to irradiate said target intermittently in a predetermined fashion, e.
means for detecting and measuring the intensity of portions of each X-ray beam passed through the object comprising a plurality of detecting elements, f.
means for memorizing the output of said detecting means along with the corresponding output signals from the rotating means, g.
means for calculating the absorption value at each micro matrix area on said cross-sectional plane from the data memorized in the memory (f), and h.
means for displaying said respective calculated absorption values.
2.
An apparatus according to claim 1 in which said electron beam source, said target, said focusing means, and said rotating means are housed in a bell-shaped vacuum column.
3.
An apparatus according to claim 1 in which said rotating means comprises a plurality of deflecting stages, at least one of said deflecting stages comprising a pair of co-axial ring-shaped electrodes.
4.
An apparatus according to claim 1 in which said detecting means is at least partially annular and is fixed.
5.
An apparatus according to claim 1 including a beam guide having at least one slit for directing the fan-shaped X-ray beam.
6.
An apparatus according to claim 5 in which said beam guide, and said detecting means are rotated by a mechanical rotating means in synchronism with said rotating means
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Processing Data 
