X-ray or gamma ray systems or devices – Beam control – Collimator
Patent
1985-05-02
1987-06-30
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Collimator
378145, 378147, 378150, 378153, 378146, G21K 104
Patent
active
046776524
ABSTRACT:
There is disclosed an improved control circuit for a slit radiographic apparatus wherein the slit radiographic apparatus is comprised of an X-ray source adapted to scan a body to be radiographed through a slit diaphragm with a planar fan beam wherein the slit diaphragm is divided into a plurality of attenuating sections each associated with a controllable X-ray attenuating member and wherein there is provided a detection assembly for detecting the intensity of the radiation having passed through the body and divided into sections corresponding to attenuating sections of the slit diaphragm wherein each X-ray attenuating member is controlled by the control circuit including an energizing circuit and a comparison circuit for each attenuating member of the slit diaphragm whereby the comparison circuit compares an output signal of an associated section of the detection means to a reference signal to form an output coupled to the energizing circuit to control the attenuating member of a respective attenuating section of the slit diaphragm so that the difference between the output signal of the section of the detection assembly and the reference signal continously pursues zero value.
REFERENCES:
patent: 3755672 (1973-08-01), Edholm et al.
patent: 4132895 (1979-01-01), Froggatt
patent: 4442538 (1984-04-01), Haendle
Duinker Simon
Vlasbloem Hugo
Church Craig E.
Freeman John C.
Marn Louis E.
N.V. Optische Industrie "De Oude Delft"
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