Radiography

Details Radiography Radiography

1976-10-26

1979-04-17

Church, Craig E.

Radiant energy

Inspection of solids or liquids by charged particles

Analyte supports

250360, G03B 4116

Patent

active

041502949

ABSTRACT:
In a computerized tomographic apparatus, a scanning device is used to project radiation through a slice disposed cross-sectionally of a body along many sets of pencil-like beam paths. Each set of paths is characterized by being oriented at a respective angle, or in some circumstances a respective mean angle, in the slice. The absorption suffered by the radiation on traversing each beam path is measured and, from all the values of absorption, the coefficient of absorption of the radiation at each of many locations distributed over the slice is calculated. The invention extends the number of paths in some only of the aforementioned sets to include further paths traversing a zone outside the slice and the absorption values relating to these further paths are used to improve the accuracy of the calculation of the coefficients of absorption.

REFERENCES:
patent: 3946234 (1976-03-01), Hounsfield
patent: 3986031 (1976-10-01), Chekrown

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