X-ray or gamma ray systems or devices – Electronic circuit – X-ray source power supply
Patent
1993-05-13
1994-12-06
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
X-ray source power supply
378 97, 378207, H05G 142
Patent
active
053717775
ABSTRACT:
An automatic x-ray exposure unit for mammography permits a correction of the mAs product dependent on the subject thickness without the need for obtaining a transparency signal, and thus without the need for the double detector normally needed for that purpose. The automatic x-ray exposure unit permits the correction to be undertaken on site, prior to conducting an actual examination, and thus can be used for film/foil systems, such as customized systems for which no previous transparency data has been obtained. This is accomplished in an automatic x-ray exposure unit where the mAs product is obtained for a fraction (1
) of the total exposure, and a total exposure value is then obtained by multiplying the fractional value by n. These values are used to generate a characteristic curve, which is stored, for the film/foil system being used. If it is then necessary to switch (adjust) the mAs value due to the subject thickness, this can be done using the stored curve.
REFERENCES:
patent: 4638500 (1987-01-01), Smits et al.
patent: 4748648 (1988-05-01), Boucle et al.
patent: 4763343 (1988-08-01), Yanaki
patent: 5166969 (1992-11-01), Heidsieck
patent: 5218625 (1993-06-01), Heidsieck
Aichinger Horst
Koehler Karlheinz
Porta David P.
Siemens Aktiengesellschaft
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