X-ray diagnostics installation

US5448613A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Joerg Haendle · Erlangen, DE
• Heinz Horbaschek · Erlangen, DE

Key dates

• Filing date: Dec 2, 1993
• Grant date: Sep 5, 1995
• Expiry date: Dec 2, 2013

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05G1/64
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An x-ray diagnostics installation has an x-ray image intensifier video chain which includes a semiconductor detector composed of pixels arranged in a matrix, serving as the video pick-up and a detector for identifying the average image brightness at the output luminescence screen of the x-ray image intensifier within a predetermined image region. A first read-out circuit is provided for pixels of a first group in the image, which is operated with a read-out clock at a first frequency, and a second read-out circuit is provided for pixels of a second group distributed over the area of the semiconductor detector, which is operated with a read-out clock at a second frequency. The second frequency is higher than the first frequency. The output signals of the pixels of the second group are supplied to an evaluation circuit, and the output signals of the first group of pixels are supplied to the video chain. Image production parameters, such as image brightness, can be controlled on the basis of the output signals of the second group of pixels.