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Proceedings Paper

Field emission x-ray tube for mammography
Author(s): Larry V. Knight; Hans K. Pew; Arturo Reyes; Hong Liu
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Paper Abstract

We propose to develop a time-gated x-ray imaging technique for screening mamography. If successful, it will greatly improve the accuracy of current mammography with about 50% reduction of current patient radiation. The technique can be applied to other x-ray imaging procedures also. We are now working to determine the feasibility of the key technologies- an x-ray source that can be pulsed on and off at a subnanosecond rate and a detector that can be gated at the same rate- that represent potential roadblocks to achieving this goal. A field emission x-ray tube will be used as the source. The field emission cathode consists of a substrate with sharp points and a metallic grid. A voltage on the grid creates an electric field that produces tunnel emission from the array of tips. The geometry of such a tube make electron optics easier, high currents are possible and the tube can be turned on and off rapidly. It also appears that synchronous electronic gating of the detector is possible.

Paper Details

Date Published: 11 October 2000
PDF: 4 pages
Proc. SPIE 4224, Biomedical Photonics and Optoelectronic Imaging, (11 October 2000); doi: 10.1117/12.403944
Show Author Affiliations
Larry V. Knight, Brigham Young Univ. (United States)
Hans K. Pew, MOXTEK, Inc. (United States)
Arturo Reyes, MOXTEK, Inc (United States)
Hong Liu, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 4224:
Biomedical Photonics and Optoelectronic Imaging
Hong Liu; Qingming Luo, Editor(s)

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