Patent ID: 9326740
Filing Date: 2016-05-03
CPC Classification: A61B,H05G

Claim Text:
1. A radiographic system that performs a radiography with X-rays generated from an X-ray tube based on image-capturing conditions that include an X-ray focal spot size, a tube current, and a tube voltage to be applied between an anode and a cathode in the X-ray tube, comprising: an X-ray tube controller configured to control a filament current flowing through a filament of the cathode of the X-ray tube for stabilizing the tube current at a desired value, the tube current otherwise tending to fluctuate at activation; an initial value calculator configured to calculate an initial value for the filament current that is to be applied at next activation, based both on a stable value of the filament current while the tube current has been stable and on the image-capturing conditions at the time; and a storage configured to store the calculated initial value, the image-capturing conditions, and a radiographic history that includes radiographed dates.