X-ray tube based on carbon nanotube field emitter for low dose mini C-arm fluoroscopy

Medical Imaging 2021: Physics of Medical Imaging Pub Date : 2021-02-15 DOI:10.1117/12.2582090

Jong-Wook Lim, A. Gupta, H. Park, Jinho Choi, Jaeik Jung, Jaekyu Jang, S. Yeo, J. Ahn, Byeongno Lee, M. Chae, J. Ryu

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引用次数: 2

Abstract

We designed and developed the vacuum sealed x-ray tube based on carbon nanotube(CNT) field emitter for mobile medical x-ray devices and also design the test bed for CNT x-ray tube. The CNT was synthesized by chemical vapor deposition(CVD) method on a metal alloy substrate. The grown CNT is assembled with a gate and a focuser and then combined into an electron gun(e-gun) through a brazing process. The the e-gun had an aging process inside the vacuum chamber. As a result of aging, the CNT e-gun was able to generate anode current of 1.5 mA at electric field of about 4 V/μm, and field emission current was also stabilized. After the aging process, the e-gun was brazed into a ceramic X-ray tube inside a high-temperature furnace at a vacuum degree of E-06 torr and vacuum sealed. Field emission characteristic was measured using this X-ray tube and compared with an e-gun, and almost similar results were obtained. Incase of Xray tube, we applied a higher electric field while controlling the current at 500ms intervals through pulse driving. As a result, X-ray images of human teeth were successfully acquired using CNT X-ray tubes.

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基于碳纳米管场发射器的x射线管用于小剂量微型c臂透视

设计并研制了用于移动医用x射线装置的基于碳纳米管场发射体的真空密封x射线管，并设计了碳纳米管x射线管试验台。采用化学气相沉积(CVD)方法在金属合金衬底上合成了碳纳米管。生长的碳纳米管由栅极和聚焦器组装，然后通过钎焊工艺组合成电子枪(e-gun)。电子枪在真空室中有一个老化过程。经过老化处理，碳纳米管电子枪在4 V/μm左右的电场下能产生1.5 mA的阳极电流，且场发射电流稳定。经过时效处理后，将电子枪在E-06托的真空度下，在高温炉内钎焊成陶瓷x射线管，并进行真空密封。用该x射线管测量了场发射特性，并与电子枪进行了比较，得到了几乎相同的结果。在x射线管中，我们施加了更高的电场，同时通过脉冲驱动以500ms的间隔控制电流。因此，利用碳纳米管x射线管成功地获得了人类牙齿的x射线图像。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Medical Imaging 2021: Physics of Medical Imaging

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