Back to results
US 5,708,694 AGranted
X-ray generator
AssigneeSiemens Aktiengesellschaft
InventorsWalter Beyerlein, Karsten Schmitt
Life of this patent
Estimating the term…
Abstract
An x-ray generator wherein the tube current is kept constant independently of the drop in the cathode temperature after the radiation is switched on has a control circuit for the tube filament current in which a correction value that corresponds to the drop in the tube current given constant filament current during the radiation phase due to the drop in temperature of the cathode is superimposed on the rated value of the filament current at the beginning of radiation.
Claims4
An x-ray generator comprising:
- an x-ray tube having a cathode operable with a filament current, said x-ray tube during emission of radiation having operating parameters associated therewith including a tube current;
- and
- control means for regulating said filament current during emission of radiation, said control means including calculating means for, using said operating parameters, identifying a correction value for a filament current reference value which corresponds to a drop in said tube current, given constant filament current during emission of radiation due to a temperature drop of said cathode, and for superimposing said correction value on said reference value.
An x-ray generator comprising:
- an x-ray tube having a cathode operable with a filament current, said x-ray tube during emission of radiation having operating parameters associated therewith including a tube current;
- and
- control means for regulating said tube current during emission of radiation, said control means including calculating means for, using said operating parameters, identifying a correction value for a tube current reference value which corresponds to a drop in said tube current, given constant filament current during emission of radiation due to a temperature drop of said cathode, and for superimposing said correction value on said reference value.
Dependencies are inferred from the claim text.