| 摘要 |
An X-ray system includes an X-ray generator for operating an X-ray tube (1) having a cathode which can be heated by a filament current (Ih), a continuation (5, 57) which is operative in an exposure mode so as to boost the filament current to a boost value (Ib), and a continuation which is also operative in the exposure mode so as to decrease the filament current and to switch on the tube voltage (U). The time elapsing until the start of exposure is reduced in that the X-ray generator has a special mode in which the filament current is boosted to the boost value (Ib) while the tube voltage (U) is switched on, circuitry (4, 6) is provided for measuring the tube current flowing in the special mode. A memory (8) is provided for storing the temporal variation of the measured tube current, or a value (Icor) derived therefrom, and the control unit (5, 57) is operative for deriving the boost time from the temporal variation stored in the memory (8).
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