Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1975-11-11
1977-03-01
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250402, 250445T, G01N 2134, G01N 2304, G01T 120, H05G 100
Patent
active
040103706
ABSTRACT:
Radiographic apparatus is described for evaluating the absorption coefficient of a body at each of a plurality of locations distributed over a planar slice disposed cross-sectionally of the body. A source is arranged to produce a fan-shaped, planar beam of radiation which is directed through the body, in the plane of said slice, and the source is orbited around the body about an axis perpendicular to the plane of said slice. Detectors are provided, and orbited in synchronism with the orbital motion of the source, each to detect the radiation emergent from the body along a plurality of paths. In order to render the paths substantially linear despite the orbital motion, a lateral scan is imposed upon the source which is sufficient, over a predetermined time period, to substantially cancel the orbital motion and replace it by a lateral motion.
REFERENCES:
patent: 3778614 (1973-12-01), Hounsfield
patent: 3852605 (1974-12-01), Watanabe et al.
patent: 3940626 (1976-02-01), Hounsfield
patent: 3949229 (1976-04-01), Albert
EMI Limited
Grigsby T. N.
Smith Alfred E.
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