Method for the automatic determination of the exposure time of a

Details Method for the automatic determination of the exposure time of a Method for the automatic determination of the exposure time of a

1991-07-05

1993-06-08

Porta, David P.

X-ray or gamma ray systems or devices

Electronic circuit

Exposure timer

378 95, 378108, 378207, H05G 142

Patent

active

052186253

ABSTRACT:
The disclosure concerns radiology instruments that include an X-ray source, a receiver of the film or film-screen type, a detection cell and means to compute the yield at the cell. The method consists of performing measurements of the yield at instants t.sub.1, t.sub.2, . . . t.sub.3 during the exposure, so as to determine the lumination or luminous exposure (the quantity of the light received multiplied by the exposure time) on the film and then computing the lumination remaining to be acquired to obtain the chosen optical density on the film.

REFERENCES:
patent: 3792267 (1974-02-01), Westerkowsky
patent: 3894235 (1975-07-01), Franke
patent: 3974385 (1976-08-01), Grim
patent: 4178508 (1979-12-01), Hotta et al.
patent: 4250103 (1981-02-01), Vatne et al.
patent: 4748648 (1988-05-01), Boucle et al.
patent: 4763343 (1988-08-01), Yanaki
patent: 4811374 (1989-03-01), Kasa et al.
patent: 4831642 (1989-05-01), Chattin

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