| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling control method of an X ray tube that can extend a life expectancy of X ray tube. SOLUTION: When X ray tube 1 is cooled by a water-cooling device 11, based on a tube voltage and/or tube current of X ray tube 1, cooling by water- cooling device 11 is controlled so that the X ray tube 1 almost maintains a desired temperature.
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