G - Physics – 03 – B
Patent
G - Physics
03
B
358/11.1
G03B 42/02 (2006.01) A61B 6/03 (2006.01) H01J 35/00 (2006.01) H05G 1/02 (2006.01)
Patent
CA 1207919
Abstract of the Disclosure: An electron beam production and control assembly especially suitable for use in producing X-rays in a computed tomo- graphy (CT) X-ray scanning system is disclosed herein along with its method of operation. This assembly produces its electron beam within a vacuum-sealed housing chamber which is evacuated of internal gases, except inevitably for small amounts of residual gas. The electron beam is produced by suitable means within the chamber and directed along a path therethrough from the chamber's rearwardmost end to its forwardmost end whereby to impinge on a suitable target for producing the necessary X-rays. Since there is residual gas within the chamber, the electrons of the beam will interact with it and thereby produce positive ions which have the effect of neutralizing the space charge of the electron beam. However, there are a number of different arrangements disclosed herein which form part of the overall assembly for acting on these ions and reducing the neutralizing effect they would otherwise have on the beam.
438934
Imatron Inc.
Smart & Biggar
LandOfFree
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