Method of and apparatus for tomographic examination of structure

Details Method of and apparatus for tomographic examination of structure Method of and apparatus for tomographic examination of structure

1979-12-03

1982-08-03

Willis, Davis L.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

G01N 2100

Patent

active

043429165

ABSTRACT:
A method of and an apparatus for tomographic examination by X-ray or gamma ray scanning of structures, intended for the display of images of slices of the structure examined by determination of the electron density in each volume element of these slices.
Using an X-ray or gamma ray source, a stationary principal detector and an auxiliary detector which is aligned with the source, for each volume element of each slice two measurements are performed of the diffusion by the Comption effect towards the principal detector and two measurements are performed of the transmission between the source and the auxiliary detector, starting with the slice nearest to the principal detector and proceeding to the slice which is situated furthest from this detector. The measuring results are progressively used for calculating the exact electron density throughout the structure examined.

REFERENCES:
patent: 3106640 (1963-10-01), Oldendorf
patent: 4124804 (1978-11-01), Mirell
patent: 4150292 (1979-04-01), Ter-Pogossian

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