Thomson-cgr

General Electric Cgr S.a.

Compagnie Generale De Radiologie

Jacques Leguen

Andre Plessis

Emile Gabbay

Jacques Delair

Dang T Quang

X-ray tube with low extra-focal radiation

An equipped forced-convection housing unit for a rotating-anode X-ray tube comprises a flow-initiating device which is integrated in the housing unit and has the function of circulating the coolant fluid surrounding the X-ray tube. This arrangement simplifies the problems relating to supply of electric power to the motor which drives the flow-initiating device and the motor which drives the anode of the X-ray tube in rotation.

Equipped force-convection housing unit for a rotating-anode X-ray tube

The invention relates to an X-ray apparatus with focus position control, the focus being formed on the anode of an X-ray tube with magnetic bearings. The X-ray apparatus comprises a focus position sensing device cooperating with electronic means associated with the magnetic bearings, in order to control the position of the focus by displacing a rotor under the action of the magnetic bearings.

X-ray apparatus with focus position control

A method and circuit arrangement for improving the definition of the focal spots of X-ray tubes which comprises periodically varying the bias voltage applied to the concentrating electrode of the tube, focalizing the eletron beam emitted by the filament, between a negative minimum or zero value and a negative maximum value, with a voltage waveform whose frequency is higher than 10 kilohertz, wherein this bias voltage has to assume at least the two extreme values frequently, while a direct-current high voltage is being applied between the cathode (filament) and the anode (target) during the exposure time.

Method and circuit arrangement for improving the radiological definition

Growing community of inventors

Paris, France

Jacques Leguen