X-Ray diagnostic system comprising means for the fixed specification of exposure time, x-ray tube voltage, and mAs-product

US4377748A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Horst Aichinger · Ergolding, DE
• Gerd Seifert · Herrsching am Ammersee, DE

Key dates

• Filing date: Apr 22, 1980
• Grant date: Mar 22, 1983
• Expiry date: Apr 22, 2000

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05G1/34
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

In an exemplary embodiment, a control loop for the x-ray tube current is present which adjusts the x-ray tube current to a value which is a function of the exposure time and the selected mAs-product. In order that deviations of the x-ray tube voltage from a desired value can be controlled via the x-ray tube current, but that the mean value of the x-ray tube current can nevertheless be kept constant, a phase angle control device, arranged in the primary circuit of the high voltage transformer, can be present as the regulating unit for the mean value of the x-ray tube current. As controller for the x-ray tube voltage, a circuit for the adjustment of the filament current of the x-ray tube can be provided.