X-ray or gamma ray systems or devices – Beam control – Antiscatter grid
Patent
1985-12-06
1989-05-09
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Antiscatter grid
378 99, G21K 100
Patent
active
048295523
ABSTRACT:
Apparatus and method for use in conjunction with an X-ray apparatus, for filtering scattered irradiation and enhancing recordation of unscattered irradiation transmitted through a subject exposed to an X-ray analysis beam. The apparatus includes a grid mechanism including filtration strips which filter scattered irradiation and obstruct unscattered irradiation from detection, a mechanism for recording an analog image of the subject from the detector, a mechanism for converting the analog image to an equivalent digital image, and a mechanism for reconstructing the image as if the unscattered irradiation absorbed by the grid were not obstructed from detection. The method comprises projecting a beam of X-ray photons at and through the subject to be examined, aligning an X-ray photon sensitive detector behind the subject with the beam of photons, filtering the scattered X-ray photons transmitted through the subject from detection with a grid of X-ray absorptive strips, recording an analog image of the subject from the detector, converting the analog image to an equivalent digital image, and reconstructing the image as if the unscattered photons are not obstructed or absorbed by the strips.
REFERENCES:
patent: 2435823 (1948-02-01), Files
patent: 2760077 (1956-08-01), Longini
patent: 4075492 (1978-02-01), Boyd et al.
patent: 4087837 (1978-05-01), Geluk
patent: 4549307 (1985-10-01), Macovski
patent: 4599742 (1986-07-01), Kikuchi et al.
Grady John
Rossi Remo J.
Church Craig E.
Oliverio M. Lawrence
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