Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-11-30
1984-08-21
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
378 99, 364414, H04N 514
Patent
active
044673515
ABSTRACT:
X-rays at a minimal exposure level representing 25% of the conventional exposure are emitted from an X-ray tube and pass through a subject, such as a patient undergoing radiographic examination. The minimal exposure X-rays are detected by a preselected detector means, such as illuminated film, an X-ray intensifier, a CT scanner, a radioactive nuclear scanner or an image intensifier in combination with a television camera. The detector converts the radiation emerging from the subject to light images in the case of the video system. The light images are converted to electronic signals in a television camera. In the case of the CT scanner and nuclear scanner a photodiode array or scintillation crystal is actuated by the emerging radiation to generate an electrical current proportional to the intensity of the emerging radiation. The electronic signal is transmitted to an analog to digital converter, and the digital signal is transmitted to a computer for storage. Simultaneously, the digital signal is processed by the computer in accordance with a mathematical model to convert the signal representing the minimal exposure level to a signal representing the maximum or conventional exposure level. Output from the computer representing the maximum exposure level is either suitably stored for later retrieval or the retrieval or the digital signals are converted to analog signals for transmission to a video display device. In this manner, a radiograph is obtained by exposing the subject to substantially less than the conventional radiation level and having the degree of spatial resolution normally obtained at the conventional radiation level.
REFERENCES:
patent: 4058832 (1977-11-01), Vagi
patent: 4323973 (1982-04-01), Greenfield
Adams John M.
Coles Edward L.
Martin John C.
Price, Jr,. Stanley J.
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