X-RAY TUBE OPERATING STATE ACQUIRING DEVICE, X-RAY TUBE OPERATING SATE ACQUIRING SYSTEM, AND X-RAY TUBE OPERATING STATE ACQUIRING METHOD

摘要

An X-ray tube controller measures operation information (the value of the grid voltage applied to a grid electrode so as to constantly maintain the value of the tube current for the filament energizing time of the X-ray tube and under a predetermined tube voltage). The operation information is transmitted to an X-ray tube operation information acquiring device through a communication line. A database where the consumption degree (the reduction rate of the amount of thermionic emission (the tube current value for a predetermined G1 voltage) to the initial value (the amount of thermionic emission when the filament is initially used)) corresponding to the integration of the filament energizing time is described is stored in a storage section of the X-ray tube operation information acquiring device. A consumption degree judging section judges the consumption degree of the filament from the integration of the filament energizing time referring to the database and judges from the G1 voltage that the life of the filament has expired.