Radiant energy – Inspection of solids or liquids by charged particles – Analyte supports
Patent
1977-12-02
1980-11-25
Smith, Alfred E.
Radiant energy
Inspection of solids or liquids by charged particles
Analyte supports
250252, A61B 602, G01T 100
Patent
active
042360790
ABSTRACT:
Scanning apparatus is disclosed for use in computerized axial tomography systems. The apparatus includes an assembly rotatable about an axis extending along a central opening defined therein, and means for positioning the body portion to be examined within the central opening so that the axis of assembly rotation is perpendicular to a plane passing through the bodily structures to be examined. A source of penetrating radiation is mounted on the assembly toward one side thereof and provides radiation in the form of a fan beam. Detector means for the radiation are positioned on the assembly opposite the source, enabling detection of radiation which traverses laterally and is not absorbed in the thin body section in which the aforementioned plane resides. Means are provided for rotating the assembly so that the fan beam impinges upon said body portion at a plurality of incident directions. Signal processing and conditioning means mounted on the assembly and movable therewith, receive the output signals from the detector means and amplify and convert same to digital form. Slip ring interconnection means rotatable with the assembly, receive the outputs from the signal processors and conditioners and interfeed these signals to a computerized image reconstruction station. Slip rings rotatable with the assembly also provide interconnection enabling power and control inputs to the radiation source and to other portions of the apparatus. The assembly is continuously rotatable through successive 360 degree rotations and the examination sequence may be initiated at any point in the rotation of the assembly. The detector comprises an array of elements and means are provided for adjusting the gains of each channel associated with the individual detector elements as an incident of the examination process, thereby enabling compensation for drift in the channels.
REFERENCES:
patent: 3655976 (1972-04-01), Doering
patent: 3724954 (1973-04-01), Dreyfoos, Jr.
patent: 4035651 (1977-07-01), LeMay
Cole Stanley Z.
General Electric Company
Grigsby T. N.
Herbert Leone F.
Smith Alfred E.
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