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

被引：139
|
作者：
Liu, Zejian [1 ]
Yang, Guang
Lee, Yueh Z.
Bordelon, David
Lu, Jianping
Zhou, Otto
机构：
[1] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA
[2] Univ N Carolina, Sch Med, Chapel Hill, NC 27599 USA
[3] Univ N Carolina, Curriculum Appl & Mat Sci, Chapel Hill, NC 27599 USA
来源：
APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 10期
关键词：
D O I：
10.1063/1.2345829
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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. (c) 2006 American Institute of Physics.
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