Siemens Aktiengesellschaft

Siemens Aktiengeselleschaft

Hans-Joachim Greiner

Heribert Amtmann

Hans Ebersberger

Martin Spahn

Mathias Hörnig

Gerd Wessels

Werner Saalfrank

Guenter Eckardt

David D Faul

Guenther Eckardt

To comply with radiation protection provisions that differ from one another for different operating functions without operational restrictions, a radiation protection system is provided in the case of a multifunctional x-ray system for a solid state detector assigned to the x-ray system. The radiation protection system includes a device for restricting the current outer contours of an x-radiation field to bounding outer contours dependent on the selected operating function of the x-ray system.

Multifunctional x-ray system and method for operating it

An x-ray diagnostic system wherein verbal, hands-free data input is available to the user for communicating with the components of the system. The components of the system, which are interconnected via a signal transmission path, include a speech recognition system for data input and a communication device designed so that available and executed commands are reproduced thereby.

X-ray system control

In an exemplary embodiment, a timing device sets the fluoroscopy time, and a program setting and display device displays the instantaneous values of the fluoroscopy voltage and current. An arithmetic unit is provided to which signals are supplied which correspond to the fluoroscopy voltage, the fluoroscopy current, and the fluoroscopy time, and which is so designed that it forms the arithmetic mean values of these quantities and brings them to display.

X-Ray diagnostic installation comprising a timing device

In an exemplary embodiment, the control circuit for controlling filament current to maintain x-ray tube voltage at a set point value is disabled near the beginning of an x-ray exposure by the cut-off of filament current to provide a falling load characteristic as a function of time. During the cooling of the x-ray tube filament, the x-ray tube voltage is maintained near its set point value by the timed switching of taps of a variable-ratio transformer to change the input voltage to the x-ray tube high voltage transformer, and by the coordinated changing of the loading of the primary circuit of such high voltage transformer, the control circuit for maintaining x-ray tube voltage at the set point value thereafter being placed in control of the filament current for the remainder of the x-ray exposure.

X-ray diagnostic generator in which the x-ray tube voltage is regulated

In an exemplary embodiment, in order to operate the X-ray diagnostic generator with a decreasing (or 'falling') load during an X-ray exposure, there is disposed in the primary circuit of the high voltage transformer a bridge rectifier in whose D.C. current branch there is disposed a series of networks each consisting of at least one resistance and one capacitor in parallel, and a switch for the purpose of switching the network into and out of the circuit. A timing control initially short circuits the resistance-capacitance networks to provide for maximum primary current at the start of an exposure, the shunt capacitor absorbing such primary current when each resistance-capacitance network is first switched into the circuit to initiate a relatively smoothly decreasing primary current as a function of time. As secondary voltage tends to decrease, the X-ray tube current is progressively reduced to maintain the selected X-ray tube voltage, the result being the desired smoothly decreasing load characteristic.

Growing community of inventors

Buckenhof, Germany

Hans-Joachim Greiner