Carbon nanotube based microfocus field emission x-ray source for microcomputed tomography

Microcomputed tomography is now widely used for in vivo small animal imaging for cancer studies. Achieving high imaging quality of live objects requires the x-ray source to have both high spatial and temporal resolutions. Preliminary studies have shown that carbon nanotube (CNT) based field emission...

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Veröffentlicht in:Applied physics letters 2006-09, Vol.89 (10)
Hauptverfasser: Liu, Zejian, Yang, Guang, Lee, Yueh Z., Bordelon, David, Lu, Jianping, Zhou, Otto
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Sprache:eng
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Zusammenfassung:Microcomputed tomography is now widely used for in vivo small animal imaging for cancer studies. Achieving high imaging quality of live objects requires the x-ray source to have both high spatial and temporal resolutions. Preliminary studies have shown that carbon nanotube (CNT) based field emission x-ray source has significant intrinsic advantages over the conventional thermionic x-ray tube including better temporal resolution and programmability. Here we report the design and characterization of a CNT based field emission x-ray source that also affords a high spatial resolution. The device uses modified asymmetric Einzel lenses for electron focusing and an elliptical shaped CNT cathode patterned by photolithography. Stable and small isotropic x-ray focal spot sizes were obtained.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2345829