X-ray or gamma ray systems or devices – Beam control – Collimator
Patent
1991-12-06
1993-07-27
Porta, David P.
X-ray or gamma ray systems or devices
Beam control
Collimator
378149, 378154, G21K 102
Patent
active
052316548
ABSTRACT:
A collimator for use in an imaging system with a radiation point source has a plurality of channels formed therein along longitudinal axes aligned with selected orientation angles that correspond to the direct beam path from the radiation source to the radiation detectors. The collimator comprises a photosensitive material coated with a radiation absorbent material. The cross-sectional shape of the channels corresponds to the cross-sectional shape of the radiation detecting area of the detector element adjoining the channel, and the sidewalls of the channel are smooth along their length. The collimator may be fabricated by forming a mask on a photosensitive collimator substrate, exposing the photosensitive substrate to light beams traveling along a path corresponding to a direct path of radiation from the radiation source to the detector elements in the assembled array, etching the collimator substrate to form channels therein along the exposed area of the substrate, and coating the substrate with a radiation absorbent material.
REFERENCES:
patent: 4288697 (1981-09-01), Albert
patent: 4321473 (1982-03-01), Albert
patent: 4958081 (1990-09-01), Malmin et al.
patent: 4969176 (1990-11-01), Marinus
Kwasnick Robert F.
Wei Ching-Yeu
General Electric Company
Ingraham Donald S.
Porta David P.
Snyder Marvin
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