Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1979-11-02
1981-03-31
Smith, Alfred E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250355, 250416TV, 358111, H05G 100, H05G 130, G01T 100, H04N 532
Patent
active
042595827
ABSTRACT:
Radiographic images are produced by situating a subject (13) between a scanning x-ray source (16) and an x-ray detector (14) to produce electrical signals indicative of variations of x-ray transmissivity in different regions of the subject (13). A signal processing system (11) enables simultaneous display of a plurality of visible images at a plurality of display devices (52 to 55) with each image emphasizing a different aspect of the information generated by a given scanning of the subject. A feedback circuit (68) from the detector (14) to the x-ray source (16) maintains the average level of the detector signal constant while allowing short term fluctuations so that only abrupt or brief changes of x-ray transmissivity in the subject are visible in a first image at a first display device (52). A second image signal circuit (93) recovers the data suppressed by the feedback circuit (68) to enable a full contrast range image to be presented at another display device (53) and to enable display at additional display devices (54, 55) of still more images, each of which emphasizes a different selected contrast range from the total range of subject transmissivity variations developed by the scanning of the subject (13). Radiation exposure of the subject (13) is reduced by enabling extraction and display of a greater amount of information from a given scanning of the subject (13).
REFERENCES:
patent: 2837657 (1958-06-01), Craig et al.
patent: 3567854 (1971-03-01), Tschautz
patent: 3949229 (1976-04-01), Albert
patent: 4032784 (1977-06-01), Rich
patent: 4032787 (1977-06-01), Albert
patent: 4144457 (1979-03-01), Albert
patent: 4149076 (1979-04-01), Albert
Fields Carolyn E.
Smith Alfred E.
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