Radiant energy – Inspection of solids or liquids by charged particles – Analyte supports
Patent
1975-10-20
1977-10-11
Smith, Alfred E.
Radiant energy
Inspection of solids or liquids by charged particles
Analyte supports
250252, G01N 2300
Patent
active
040537803
ABSTRACT:
The method of calibrating an axial tomographic scanner including frame means having an opening therein in which an object to be examined is to be placed, source and detector means mounted on the frame means for directing one or more beams of penetrating radiation through the object from the source to the detector means, and means to rotate the scanner including the source and detector means about the object whereby a plurality of sets of data corresponding to the transmission or absorption by the object of a plurality of beams of penetrating radiation are collected; the calibration method comprising mounting calibration means supporting an adjustable centering member onto the frame means, positioning the adjustable centering member at approximately the center of rotation of the scanner, placing position-sensitive indicator means adjacent the approximately centered member, rotating the scanner and the calibration means mounted thereon at least one time and, if necessary, adjusting the positioning of the centering member until the centering member is coincident with the center of rotation of the scanner as determined by minimum deflection of the position-sensitive indicator means, rotating and translating the source and detector means and determining for each angular orientation of the frame means supporting the source and detector means (a) the central position of each translational scan relative to the centered member and/or (b) if a plurality of detectors are utilized with the detector means for each planar slice of the object being examined, the central position of each translational scan for each detector relative to the centered member.
REFERENCES:
patent: 3178575 (1965-04-01), Koerner
patent: 3778614 (1973-12-01), Hounsfield
Anderson B. C.
Hirsch Joseph I.
Smith Alfred E.
Syntex (U.S.A.) Inc.
Walker William B.
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