Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1986-12-19
1989-04-18
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
2505051, G01T 1164, G21K 102
Patent
active
048230170
ABSTRACT:
A fan-beam collimator has a plurality of focal lengths. The shortest focal length is located at the center of the collimator. The longest focal length is located at the periphery of the collimator. The focal length increases between the minimum focal length and the maximum focal length.
REFERENCES:
patent: 3688113 (1972-08-01), Miraldi
patent: 3777148 (1973-12-01), Miraldi
patent: 4250392 (1981-02-01), Leask et al.
patent: 4670657 (1987-06-01), Hawman et al.
Fields Carolyn E.
Jay Mark H.
Siemens Gammasonics Inc.
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