Devices and methods for producing multiple X-ray beams from multiple locations
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United States of America Patent
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Issued Date -
Dec 2, 2004
app pub date -
May 30, 2003
filing date -
May 30, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A multi-beam x-ray generating device includes a stationary field-emission cathode having a plurality of stationary and individually controllable electron-emitting pixels disposed in a predetermined pattern on the cathode, an anode opposing the cathode comprising a plurality of focal spots disposed in a predetermined pattern that corresponds to the predetermined pattern of the pixels, and a vacuum chamber enveloping the anode and cathode. An additional construction is in the form of an a x-ray generating device including a stationary field-emission cathode, the cathode having a planar surface with an electron-emissive material disposed on at least a portion thereof, a gate electrode disposed in parallel spaced relationship relative to the planar surface of the cathode, the gate electrode having a plurality of openings having different sizes, an anode opposing the cathode and spaced therefrom, the anode having a plurality of focal spots aligned with the electron-emissive material, and a vacuum chamber enveloping the anode and cathode, wherein the gate electrode is operable such that the openings can be manipulated to bring at least one beam of electrons emitted from the cathode into and out of registry with at least one of the focal spots. Associated methods are also described.
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