X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1986-08-01
1989-05-23
Howell, Janice A.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 4, 378901, G01N 2300, G01N 2308
Patent
active
048336980
ABSTRACT:
The present invention is an apparatus for producing tomographic images of an object comprising: a beam of collimated radiation transmitted through the object in a plurality of rays, an imaging electro-optic detector for detecting the attenuated transmitted radiation after it has passed through the object, the detector including an energy convertor, image format altering device, and a readout device, wherein the detector has a detective quantum efficiency greater than 0.05, a total signal dependent background less than 10 percent of the signal from the unattenuated x-ray beam, a useful dynamic range greater than 10, a non-uniformity of response between adjacent active pixels of less than 75%, and deviations of geometric linearity that is less than 10 pixels in the recorded image, means for obtaining the attenuation coefficients from the transmitted radiation, and means for computing a reconstructed image of the object from the attenuation coefficients.
REFERENCES:
patent: 4298800 (1981-11-01), Goldman
patent: 4521688 (1985-11-01), Yin
Flannery, Brian et al., 3-D X-Ray Microtomography, Science, Sep. 18, 1987, pp. 1439-1444.
Deckman Harry W.
Eisenberger Peter M.
Flannery Brian P.
Roberge Wayne G.
Exxon Research and Engineering Company
Hantman Ronald D.
Howell Janice A.
Hynds Joseph A.
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