Carbon Nanotube Field-Emission Micro-focus X-ray Tube

碳纳米管场发射微焦点X射线管

• 批准号: 6933703
• 负责人: Peng Wang
• 金额: $ 9.8万
• 依托单位: XINTEK, INC.
• 依托单位国家: 美国
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2006-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6933703
• 关键词: Animalia; X ray; bioengineering /biomedical engineering; biomaterial development /preparation; biomaterial evaluation; biomedical equipment development; computer simulation; electron optics; nanotechnology; whole body imaging /scanning

DESCRIPTION (provided by applicant): Substantial technological growth has spurred a new interest in imaging techniques, and their usage has grown considerably. High-resolution small animal imaging systems have emerged as important new tools for laboratory animal research. X-ray imaging is widely used in diagnostic radiology, biomedical research and a wide variety of industrial applications. We propose to design and construct a portable, low cost micro-focus x-ray tube using the carbon nanotube (CNT) field emission source as the cathode to overcome disadvantages of the hot electron sources in the present x-ray tubes. By implementing the proposed research (Phase I and II), we expect to be able to demonstrate new compact x-ray tube with the following features: high imaging resolution down to 30 um or smaller, electronic controllable effective focal spot in 30 ~ 100 um range, portable device with extended lifetime of up to 3000 hours, capability of electronic triggering the x-ray at the rate of 1-10 millisecond (msec) per image, 100-500 uA tube current with 1% stability under 40-100KVp voltage. The primary application of the proposed x-ray source is for small animal imaging. The major research design and methods to achieve the proposed development goals include: a) Synthesis and processing of proprietary carbon nanotube materials; b) Fabrication of CNT based field emission cathode capable of generating 1-5 A/cm2 field emission current density, c) Integration of gated electron source employing the CNT source technique developed at Xintek, d) Evaluation of the electron emission characteristics including threshold field, current stability, and lifetime, e) Design and construction of prototype portable x-ray device, f) Computer simulation to the electron optics designed to simplify the focus structure, g) Evaluation of the new type x-ray tube by studying the key imaging characteristics: x-ray energy spectrum, flux, high voltage stability, spatial resolution/focal spot, pulsed x-ray radiation with millisecond pulse width.

描述（由申请人提供）：实质性的技术增长已经激发了对成像技术的新兴趣，并且它们的使用已经显著增长。高分辨率小动物成像系统已成为实验室动物研究的重要新工具。X射线成像广泛用于诊断放射学、生物医学研究和各种工业应用。为了克服现有X射线管中热电子源的不足，我们提出了一种以碳纳米管（CNT）场发射源为阴极的便携式、低成本的微焦点X射线管。通过开展拟议的研究，（第一阶段和第二阶段），我们希望能够展示具有以下功能的新型紧凑型X射线管：成像分辨率可达30 μ m或更低，有效焦斑可在30 ~ 100 μ m范围内电子控制，便携式装置寿命可达3000小时，能够以1-10毫秒（msec）/图像的速率电子触发X射线，100-500 uA管电流，在40- 100 KVp电压下具有1%的稳定性。所提出的X射线源的主要应用是用于小动物成像。主要的研究设计和方法，以实现拟议的发展目标包括：a）合成和加工专有的碳纳米管材料; B）能够产生1-5 A/cm 2场发射电流密度的基于CNT的场发射阴极的制造，c）采用Xintek开发的CNT源技术的门控电子源的集成，d）包括阈值场的电子发射特性的评估，电流稳定性和寿命，e）原型便携式X射线设备的设计和构造，f）对设计用于简化焦点结构的电子光学器件的计算机模拟，g）通过研究关键成像特性来评估新型X射线管：X射线能谱、通量、高电压稳定性、空间分辨率/焦点、具有毫秒脉冲宽度的脉冲X射线辐射。