X-ray or gamma ray systems or devices – Beam control – Scanner
Patent
1988-06-28
1989-08-08
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Scanner
378145, G21K 510
Patent
active
048560405
ABSTRACT:
An apparatus and method for slit radiography, in which a body to be irradiated is scanned at least twice by means of a planar, fan X-ray beam emitted from an X-ray source (1) via a slit diaphragm (2), the hardness of which beam increases with each next scanning motion, in which an X-ray detector (6) mounted behind the body collects the radiation passed, sections of detection means (10), which sections are juxtaposed in the longitudinal direction of the X-ray detector, produce electrical signals depending upon the radiation collected by the respective X-ray detector sections, which signals are sampled during each scanning motion and are stored in a memory, and the diaphragm (2) includes controllable elements juxtaposed in the longitudinal direction of the slit in a plurality corresponding to that of the sections of the detection means, which controllable elements are each operative to locally block the slit diaphragm during a next scanning motion if a stored signal produced by the corresponding section of the detection means during a preceding scanning motion exceeds a predetermined value.
REFERENCES:
patent: 4677652 (1987-01-01), Duinker
patent: 4731807 (1988-03-01), Plessis
B.V. Optische Industrie "De Oude Delft"
Church Craig E.
Marn Louis E.
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