X-ray or gamma ray systems or devices – Beam control
Patent
1989-01-09
1990-01-02
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Beam control
378146, 378151, 378152, G21K 104
Patent
active
048918334
ABSTRACT:
A dynamic scanning X-ray machine has a detector with an array of crystals which respond to X-rays and a circuit made of semiconductor material, both of which deteriorate when exposed to X-rays. A pair of blinder plates which are opaque to X-rays normally cover the detector and semiconductor material to prevent their deterioration by the X-rays. The blinder plates are separated from each other by an adjustable distance to form a gap which enables the X-rays to reach the detector. An object under study and the blinders move in synchronism through the X-ray field so that a part of the X-ray field forming the shadow of the object passes through the gap formed by the separation between the blinder plates and falls upon the detector, while the detector crystals and semiconductor material are shielded from the remainder of the X-ray field. The shielding of the detector crystals and semiconductor material does not have any effect upon the image of the object under study. The distribution of a field of light simulates the distribution of the field of X-rays. The light is reflected by mirrors onto a photocell sensor which can thus detect the presence of X-rays without being exposed to them.
REFERENCES:
patent: 3588511 (1971-06-01), Montagne
patent: 4005311 (1977-01-01), Ledley
Bio-Imaging Research, Inc.
Fields Carolyn E.
Porta David P.
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