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Proceedings Paper

Design and characterization of a carbon-nanotube-based micro-focus x-ray tube for small animal imaging
Author(s): Shabana Sultana; Xiomara Calderón-Colón; Guohua Cao; Otto Zhou; Jianping Lu
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Paper Abstract

We report the progress in development of carbon nanotube (CNT) field emission micro-focus x-ray tubes for dynamic small animal imaging with high spatial and temporal resolution. Extensive electron optics simulations were performed to study the focusing structure and optimize the tube design. 3D finite element analysis was used for modeling and simulating electron beam optics. A simple and intuitive model is developed to model the field emission properties of CNT cathodes. The dependence of focus spot size and the anode current on the gate extracting voltage, the focusing voltages, the gate mesh geometry, and other geometric parameters were studied. Several tubes were built according to the optimal design. The experimentally measured focus spot size and its dependence on the focus voltages were found to be in quantitative agreement with simulations.

Paper Details

Date Published: 23 March 2010
PDF: 9 pages
Proc. SPIE 7622, Medical Imaging 2010: Physics of Medical Imaging, 76225G (23 March 2010); doi: 10.1117/12.844350
Show Author Affiliations
Shabana Sultana, The Univ. of North Carolina at Chapel Hill (United States)
Xiomara Calderón-Colón, The Univ. of North Carolina at Chapel Hill (United States)
Guohua Cao, The Univ. of North Carolina at Chapel Hill (United States)
Otto Zhou, The Univ. of North Carolina at Chapel Hill (United States)
Jianping Lu, The Univ. of North Carolina at Chapel Hill (United States)


Published in SPIE Proceedings Vol. 7622:
Medical Imaging 2010: Physics of Medical Imaging
Ehsan Samei; Norbert J. Pelc, Editor(s)

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