X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1986-11-19
1990-01-02
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 19, 378901, 36441319, G01N 2300, G01N 2308
Patent
active
048918296
ABSTRACT:
The present invention is an apparatus and a method for producing tomographic images of an object irradiated by a beam of collimated radiation transmitted in a plurality of rays through a set of coplanar sections of an object as viewed from a plurality of angles about a rotation axis. The apparatus includes an imaging electro-optic detector to record the transmitted radiation, wherein the electro-optic detector alters the image format, the format alteration being focused; means to determine and align the projected position of the rotation axis on the electro-optic detector; means to align the object with respect to the rotation axis; means to determine and assure spatial uniformity of detector response; means to reduce signal dependent backgrounds; means to determine the projection coefficients from the transmitted radiation with respect to one or more reference calibration exposures; and means to compute a reconstructed image of the object's attenuation coefficients.
REFERENCES:
patent: 4071760 (1978-01-01), LeMay
patent: 4298800 (1981-11-01), Goldman
patent: 4343995 (1982-08-01), Klausz
patent: 4521688 (1985-06-01), Yin
patent: 4670840 (1987-06-01), Freundlich
patent: 4682291 (1987-07-01), Reuveni
Deckman Harry W.
Flannery Brian P.
Exxon Research and Engineering Company
Fields Carolyn E.
Hantman Ronald D.
Hynds Joseph A.
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