X-ray tube for a stereoscopic imaging

An x-ray tube for a stereoscopic imaging, comprising:

• an evacuated x-ray tube housing;
• an electron emitter apparatus in the x-ray tube housing, the electron emitter apparatus including a first field effect emitter with a first emitter surface and a second field effect emitter with a second emitter surface,
• the first emitter surface and the second emitter surface having a substantially x-ray-transparent material,
• at least one of the first emitter surface or the second emitter surface being segmented such that a portion of an electron-emitting surface can be set relative to the first emitter surface and the second emitter surface by selectively switching emitter segments of at least one of the first emitter surface or the second emitter surface;
• an anode unit in the x-ray tube housing, the anode unit configured to generate x-ray radiation for the stereoscopic imaging as a function of electrons striking two focal points;
• and
• a control unit, wherein
• the first emitter surface and the second emitter surface are arranged in a beam path of the x-ray radiation generated in respective focal points of the two focal points, and the control unit is configured to set a distance between the two focal points by indicating the portion of the electron-emitting surface of at least one of the first emitter surface or the second emitter surface.