Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1978-01-03
1979-06-19
Church, Craig E.
Radiant energy
Coded record and readers; invisible radiant energy type
250273, 250320, 250358R, G03B 4116
Patent
active
041587707
ABSTRACT:
A system for imaging a subject, such as a human being, in which there has been injected a contrast agent which absorbs radiation of a predetermined frequency. The system utilizes a source of high energy radiation such as X or gamma radiation. The source is a composite of first and second radiating materials each of which is arranged in a predetermined pattern or code, each pattern having both luminous and dark regions. In one embodiment, the luminous regions of one pattern are in registration with the dark regions of the other pattern, these regions being spaced apart in an alternative embodiment. The characteristic frequencies of radiation emitted by the first and second materials are respectively lower and higher than the predetermined absorption frequency. A detector of radiation is positioned relative to the subject and the source such that radiation propagating through the subject is incident upon the detector. Since the absorption edge of the contrast agent lies between the two characteristic frequencies of radiation, radiation from the second material is preferentially absorbed by the contrast agent with the result that the contrast agent appears to be illuminated by a coded source while the remainder of the subject may be regarded as illuminated essentially by a uniform uncoded source. Imaging is accomplished by a decoding of a detected coded image. Substances within the subject having other absorption frequencies are not imaged since the radiations of both materials are essentially equally absorbed by the subject so that the source appears uncoded.
REFERENCES:
patent: 3748470 (1973-07-01), Barrett
patent: 3801785 (1974-04-01), Barrett
Barrett Harrison H.
Davis, Jr. Luther
Bartlett Milton D.
Church Craig E.
Pannone Joseph D.
Raytheon Company
Warren David M.
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