Siemens has completed an investigation of the reported event.When operating an x-ray tube, heat is generated dependent on the degree of use.To remove the heat, the x-ray tube is equipped with an internal primary cooling.Generated heat is removed via an oil circuit and heat is removed with a secondary water circuit.In the event of a cooling system failure, the system can continue to be operated for a period of time.The failure is announced to the operator by displaying "tube hot, have a break" and the operator can than decide to continue or terminate the procedure.This kind of failure is very rare, however, a field corrective action was reported to the fda via 2240869-07/15/16-0022-c.Parts of the system cooling have been changed and no recurrence has been communicated.
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