Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1977-02-25
1978-08-01
Church, Craig E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250409, 250413, G03B 4116
Patent
active
041045246
ABSTRACT:
In an illustrated embodiment, a detector having a plurality of measuring fields is provided with a computer circuit for the formation of a difference signal which corresponds to the difference between the greatest and the smallest output signal of the measuring fields, a computer circuit for the formation of a sum signal which corresponds to the sum of the greatest and the smallest output signal of the measuring fields, and a division circuit is connected to provide an output as a function of the difference signal divided by the sum signal, as a measure of contrast over the selected measurement surface. The contrast signal can be utilized to control the duration of an exposure. Further, the contrast signal can be used for an automatic adjustment of the x-ray tube high voltage during an exposure so as to achieve an optimum picture contrast.
REFERENCES:
patent: 3586860 (1971-06-01), Husbuarna
Aichinger Horst
Koehler Karlheinz
Kranberg Heinz-Erik
Church Craig E.
Siemens Aktiengesellschaft
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