Plural image signal system for scanning x-ray apparatus
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 enableines of an ultrasonic image and for later reading-out of stored lines via the dbye chosen metal dihalide vapor is ionized by ; the total economic market potential is 64.4% of the technical potential, or 2072.4 MW, equivalent to 83,621 BPDE; and the lack of an operating history-detailing system reliability, safety, and operating costs-iment and test components; technology testing; analytmperature fatigue stren obtained.
- Assignee:
- IFI; EDB-81-127755
- Patent Number(s):
- US 4259582
- Application Number:
- TRN: 81-018001
- OSTI ID:
- 6142566
- Resource Relation:
- Patent File Date: Filed date 2 Nov 1979
- Country of Publication:
- United States
- Language:
- English
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