Patent Number: 
Section: claims

1. An X-ray tube comprising:a. a vacuum enclosure;b. a cathode disposed within the vacuum enclosure for emitting a beam of electrons;c. an anode adapted for rotation about an axis of rotation, inside, and with respect to, the vacuum enclosure; andd. at least one collimator aperture adapted for co-rotation within the vacuum enclosure with the anode,wherein the at least one collimator aperture is disposed above a plane transverse to the axis of rotation containing a locus of focal spots of the beam of electrons. 2. An X-ray tube in accordance with claim 1, wherein the at least one collimator aperture is disposed within the anode. 3. An X-ray tube in accordance with claim 1, further comprising a wedge opening, wherein the at least one collimator aperture is contiguous with the wedge opening in the anode. 4. An X-ray tube in accordance with claim 1, further comprising an external collimator aperture disposed outside the vacuum enclosure. 5. An X-ray tube in accordance with claim 1, further comprising a co-rotating collimator ring adapted for co-rotation with the anode.