X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1994-08-10
1996-01-16
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378 96, 378 9811, 378 9812, H05G 164
Patent
active
054855012
ABSTRACT:
An x-ray examination installation includes an x-ray source for irradiating an examination subject with x-rays, and an automatic exposure unit having a radiation detector composed of a matrix of detector elements. Only the output signals of specified detector elements, which define the measuring field within which an optimum exposure should ensue, are utilized for generating a signal which is then supplied to the x-ray source for controlling the exposure dose. The automatic exposure unit is operated according to a method wherein a distribution of the grayscale values in a test image is first calculated, and subsequently the main image is produced with the previously-calculated distribution of grayscale values superimposed in the main image.
REFERENCES:
patent: 5003571 (1991-03-01), Kido et al.
patent: 5148460 (1992-09-01), Aichinger
patent: 5289520 (1994-02-01), Pellegrino
patent: 5315631 (1994-05-01), Hillen et al.
"Untersuchungen uber den Einfluss des Strahlemreliefs auf die mittlere Filmschwarzung--eine bei Belichtungsautomaten auftretende Fragestellung," Widenmann et al., Rontgem-Blatter, vol. 15, No. 4, Apr., 1962, pp. 97-107 (no translation).
Porta David P.
Siemens Aktiengesellschaft
Wong Don
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