High flux X-ray target and assembly

An X-ray tube assembly comprising:

• an envelope having at least a portion thereof substantially transparent to X-ray;
• a cathode assembly disposed in the envelope;
• and
• an anode assembly disposed in the envelope, the anode assembly comprising:
• an X-ray target having a target surface;
• and
• an oscillatory coupling attached to the target, the oscillatory coupling configured to permit the X-ray target to oscillate;
• and
• a drive assembly comprising a rotor attached to the X-ray target and a stator configured to provide an oscillatory motion to the X-ray target;
• wherein the X-ray target comprises a target surface configured to remain at a substantially fixed distance from the cathode assembly during oscillatory motion;
• and
• wherein the X-ray target and drive assembly are configured to oscillate the target to vary a focal point on the target surface.