X-ray diagnostics installation having a mean image brightness de

Details X-ray diagnostics installation having a mean image brightness de X-ray diagnostics installation having a mean image brightness de

1989-09-21

1991-01-01

Howell, Janice A.

X-ray or gamma ray systems or devices

Electronic circuit

Object responsive control

378 99, 358111, H05G 110

Patent

active

049824180

ABSTRACT:
An x-ray diagnostics installation has a detector for the mean image brightness in a predetermined region which is within the x-ray beam path. The detector is formed by a matrix of individually activateable detector elements. A control unit, connected to the detector, has a memory in which data sets are stored respectively corresponding to different anatomical parts and positions of those parts. A selection unit identifies and selects a data set corresponding to the anatomical part currently being examined, and the detector elements in the array corresponding to that part are then activated via the control unit. The radiation incident on the acitvated detector elements is then compared, in the aggregate, to a rated value, and the radiation dose is controlled on the basis on the comparison.

REFERENCES:
patent: 4076985 (1978-02-01), LeMay
patent: 4185198 (1980-01-01), Fujimoto
patent: 4335311 (1982-06-01), Lutz et al.
patent: 4517594 (1985-05-01), Horbaschek
patent: 4674108 (1987-06-01), Asahina et al.

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