Radiant energy – Radiation controlling means
Patent
1981-02-26
1983-12-06
Anderson, Bruce C.
Radiant energy
Radiation controlling means
378149, G02B 500, G21K 100, H01J 152
Patent
active
044195850
ABSTRACT:
A variable angle radiation collimator particularly for use in gamma-photon medical diagnostic systems in a gamma-photon camera system for radiological examination of human subjects. The collimator provides collimation of gamma-photon radiation along a single beam direction which may be varied along two axes to adjust exposure angle or to provide a scanning capability. The collimator is a stack of substantially identical radiation-opaque plates, each of which are apertured with a similar array of openings. The combined effect of the stacked aperture plates is to transmit radiation in a predetermined orientation. The collimated angle of the radiation thus generated is controlled by the coincidence of the array of openings. The stack is retained by a mechanism which permits adjustment of the collimation angle, and the plates are fabricated to provide ease of shear motion during such adjustment. In addition, the tradeoff between the resolution and intensity of radiation transmitted may be easily varied by adjusting stack thickness.
REFERENCES:
patent: 1874577 (1932-08-01), Morrison
patent: 2138555 (1938-11-01), tvos
patent: 2336026 (1943-12-01), Millenaar
patent: 3869615 (1975-03-01), Hoover et al.
patent: 3934142 (1976-01-01), Hounsfield
patent: 4315146 (1982-02-01), Rudin
Alpert Nathaniel M.
Moore Richard H.
Strauss H. William
Anderson Bruce C.
Massachusetts General Hospital
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