Tomographic apparatus for producing transverse layer images

Details Tomographic apparatus for producing transverse layer images Tomographic apparatus for producing transverse layer images

1977-06-24

1979-01-09

Smith, Alfred E.

Radiant energy

Inspection of solids or liquids by charged particles

Analyte supports

250363S, 250385, A61B 602

Patent

active

041340183

ABSTRACT:
In an illustrated embodiment radiation detectors are associated with respective signal processing channels which have components subject to errors which vary in the course of time because of external influences such as temperature and aging effects. Each signal channel is subjected to a calibration cycle by introducing an impulse change in the supply voltage common to the respective detectors. Where xenon detectors are utilized in conjunction with integrators, the variation in detector gas volume and capacitance due to manufacturing tolerances may be compensated by storage of a constant value. Thereafter, calibration cycles may provide for automatic correction of the measurement signals for subsequent errors. A calibrating cycle can take place prior to initiation of a patient radiograph, or between two x-ray flashes during the angular scanning process.

REFERENCES:
patent: 4068306 (1978-01-01), Chen et al.

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