The Excillum MetalJet X-ray tubes are conventional microfocus tubes with the solid-metal anode replaced by a liquid metal-jet. This type of anode is continuously regenerated and already in the molten stage. Thereby, the classical power limit of an X-ray source, when the anode is permanently damaged by the electron beam, may be disregarded. The metal-jet supports higher electron-beam power and can therefore generate higher X-ray flux.