X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1982-11-17
1985-02-12
Smith, Alfred E.
X-ray or gamma ray systems or devices
Specific application
Absorption
378156, A61B 600
Patent
active
044995911
ABSTRACT:
A radiation source emits a beam of penetrating radiation toward an examination object. A protective filter, fabricated of yttrium foil attached to a bakelite card, is positioned in the path of the radiation beam between the source and the examination object. The yttrium filter has a preselected critical absorption edge operable to obstruct from the beam photon energy below 20 keV and permit a filtered beam having a photon energy above 20 keV to pass through the examination object. The filtered radiation emerging from the examination object is detected by preselected means, such as illuminated film, an X-ray intensifier, a CT scanner, or the like. The detector generates an output signal corresponding to the intensity of the emerging filtered radiation. An image processor converts the output signals to a radiographic image displaying the examination object.
REFERENCES:
patent: 1624443 (1927-04-01), St. John
patent: 2225940 (1940-12-01), Grossman
patent: 2901631 (1959-08-01), Hansen et al.
patent: 3402292 (1968-09-01), Baecklund
patent: 3515874 (1970-06-01), Bens et al.
patent: 3854049 (1974-12-01), Mistretta et al.
patent: 3860817 (1975-01-01), Carmean
patent: 3976889 (1976-08-01), Noske et al.
patent: 4029963 (1977-06-01), Alvarez et al.
patent: 4101766 (1978-07-01), Minami
Kuhn, H., "Reducing the Patient Dose by Prefiltration," Electromedica, Feb. 1982, pp. 41-43.
Rossi, R. P., "Reduction of Radiation Exposure in Radiography of the Chest," Radiology, 144, Sep. 1982, pp. 904-914.
Doi, K., et al., "Development of a Rigid Fluorescent X-ray Source for Monoenergetic Radiation Studies in Radiographic Imaging," Radiology, 142: 233-236, Jan. 1982.
Adams John M.
Grigsby T. N.
Price, Jr,. Stanley J.
Smith Alfred E.
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