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Proceedings Paper

A digital compact x-ray tube with carbon nanotube field emitters for advanced imaging systems
Author(s): Jae-woo Kim; Jin-Woo Jeong; Jun-Tae Kang; Sungyoul Choi; Jeongyong Choi; Seungjoon Ahn; Yoon-ho Song
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Paper Abstract

We have successfully developed a fully vacuum-sealed CNT x-ray source in a very compact tube without any active vacuum pump. The brazing process was specially designed and adopted for the vacuum sealing of the x-ray tube at an elevated temperature. This method enables us to obtain and maintain a desired vacuum level for the reliable electron emission from the CNT emitters after the vacuum packaging. The CNT x-ray tube also had a novel focusing electrode to effectively focus electron beams from the CNT emitters on a small area of the anode target, giving a small focal spot of below 0.3 mm with a large tube current of above 50 mA. The active-current control modulated the CNT x-ray source digitally with a low voltage of below 5 V and enhanced its stability further. Also, the pull-up circuit positioned at the cathode node of the x-ray tube shortened the response time down to several micro second. The developed CNT x-ray tube can open up new applications in medical imaging like a stationary tomosynthesis or pulsed fluoroscopy over conventional hot-cathode x-ray sources.

Paper Details

Date Published: 6 March 2013
PDF: 6 pages
Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 866861 (6 March 2013); doi: 10.1117/12.2008084
Show Author Affiliations
Jae-woo Kim, Electronics and Telecommunications Research Institute (Korea, Republic of)
Univ. of Science & Technology (Korea, Republic of)
Jin-Woo Jeong, Electronics and Telecommunications Research Institute (Korea, Republic of)
Jun-Tae Kang, Electronics and Telecommunications Research Institute (Korea, Republic of)
Sungyoul Choi, Electronics and Telecommunications Research Institute (Korea, Republic of)
Jeongyong Choi, Electronics and Telecommunications Research Institute (Korea, Republic of)
Seungjoon Ahn, Electronics and Telecommunications Research Institute (Korea, Republic of)
Sun Moon Univ. (Korea, Republic of)
Yoon-ho Song, Electronics and Telecommunications Research Institute (Korea, Republic of)
Univ. of Science & Technology (Korea, Republic of)


Published in SPIE Proceedings Vol. 8668:
Medical Imaging 2013: Physics of Medical Imaging
Robert M. Nishikawa; Bruce R. Whiting; Christoph Hoeschen, Editor(s)

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