Radiant energy – Luminophor irradiation
Patent
1975-03-11
1976-11-30
Smith, Alfred E.
Radiant energy
Luminophor irradiation
250402, G03B 4116
Patent
active
039951618
ABSTRACT:
The invention relates to an automatic X-ray exposure device having a measuring member, for example, an ionization chamber comprising a large number of measuring fields, for example, 5 .times. 5. Each measuring field is associated with a capacitor which, during television fluoroscopy, receives the part of the video signal which is derived from the part of the television image in which the dose or the dose power is to be measured in the associated measuring field. Therefore, the capacitors having the highest and the lowest voltage, respectively, have associated therewith the measuring fields having the largest and the smallest, respectively, dose or dose power. Subsequently, the measuring fields whose dose or dose power is situated in a given organ-dependent range between a maximum and a minimum value are determined and actuated for the automatic exposure in a subsequent exposure.
REFERENCES:
patent: 2829273 (1958-04-01), Fransen
patent: 3546461 (1970-12-01), Craig
patent: 3854096 (1974-12-01), Hermeyer
patent: 3860821 (1975-01-01), Barrett
patent: 3894235 (1975-07-01), Franke
patent: 3902069 (1975-08-01), Skarke et al.
Anderson B. C.
Drumheller Ronald L.
Smith Alfred E.
Trifari Frank R.
U.S. Philips Corporation
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