New field-emission x-ray radiography system

Senda, Shoichi; Tanemura, Masaki; Sakai, Yusuke; Ichikawa, Yo; Kita, S.; Otsuka, Takanobu; Haga, Akihiro; Okuyama, F.

doi:10.1063/1.1711140

Cited by 28 publications

(14 citation statements)

References 9 publications

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“…This work, however; lead to a heightened interest which gave rise to some of the first studies on FE using CNTs in 1995 [136,137]. By the start of the following decade a range of applications had been identified to utilise these novel field emitters, including high resolution electron beam microscopes [138][139][140][141], flat panel displays [27,28,[142][143][144], RF devices [18,32], electron beam lithography [145][146][147] and X-ray cathode emitters [148][149][150][151]. An early review [146], provides a concise overview of the state-of-the-art prior to 2004.…”

Section: Field Emission Application Of Cntsmentioning

confidence: 99%

X-ray generation using carbon nanotubes

et al. 2015

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Since the discovery of X-rays over a century ago the techniques applied to the engineering of X-ray sources have remained relatively unchanged. From the inception of thermionic electron sources, which, due to simplicity of fabrication, remain central to almost all X-ray applications, there have been few fundamental technological advances. However, with the emergence of ever more demanding medical and inspection techniques, including computed tomography and tomosynthesis, security inspection, high throughput manufacturing and radiotherapy, has resulted in a considerable level of interest in the development of new fabrication methods. The use of conventional thermionic sources is limited by their slow temporal response and large physical size. In response, field electron emission has emerged as a promising alternative means of deriving a highly controllable electron beam of a well-defined distribution. When coupled to the burgeoning field of nanomaterials, and in particular, carbon nanotubes, such systems present a unique technological opportunity. This review provides a summary of the current state-of-the-art in carbon nanotube-based field emission X-ray sources. We detail the various fabrication techniques and functional advantages associated with their use, including the ability to produce ever smaller electron beam assembles, shaped cathodes, enhanced temporal stability and emergent fast-switching pulsed sources. We conclude with an overview of some of the commercial progress made towards the realisation of an innovative and disruptive technology.

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Section: Field Emission Application Of Cntsmentioning

confidence: 99%

X-ray generation using carbon nanotubes

et al. 2015

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“…And according to recent study [1][2][3], the field emission type x-ray sources may be developed to miniature tubes [4], microfocus tomography systems [5] and conventional radiography systems [6][7][8][9]. In the x-ray system, the anode target which can generate x-ray radiation should be collided with high-energy electron from cathode part.…”

Section: Introductionmentioning

confidence: 99%

A carbon nanotube paste with high emission currnet for the X-ray tube

Kim

Park

Jeong

et al. 2012

25th International Vacuum Nanoelectronics Conference

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Field emission properties of CNTs(carbon nanotubes) have been investigated in the various field, such as flat panel display and x-ray sources. Especially, the x-ray tube which fabricated using the CNTs can be operated with low power consumption compare with filament-based x-ray tubes. The cold cathode -CNTs-can be operated at the lower voltage and the electron which coming out from the CNTs can be controlled easilly by focus electrode.And for high emission current, the device should be stable at the high operate voltage. The gate electrode -mesh-type electrode-can be layered by using glass frit and firing process. At this point, the mesh structure can be controlled for the higher adhesion force which is for the emission stability at the high voltage. The glass frit could be act effectively between mesh electrode and insulating layer because of the designed mesh structure.

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“…The advantages of CNT-based x-ray devices are fast response time, fine focal spot, low power consumption, possible miniaturization, longer life, and low cost. Besides, it minimizes the need of cooling required by the conventional method [152], [158], [159]. Miniaturized x-ray devices can be inserted into the body by endoscopy to deliver precise x-ray doses directly at a target area without damaging the surrounding healthy tissues, as malignant tumors are highly localized during the early stage of their development.…”

Section: ) Radiation Oncologymentioning

confidence: 99%

Carbon Nanotubes for Biomedical Applications

Sinha

Yeow

2005

IEEE Trans.on Nanobioscience

388

218

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Abstract-Carbon nanotubes (CNTs) have many unique physical, mechanical, and electronic properties. These distinct properties may be exploited such that they can be used for numerous applications ranging from sensors and actuators to composites. As a result, in a very short duration, CNTs appear to have drawn the attention of both the industry and the academia. However, there are certain challenges that need proper attention before the CNTbased devices can be realized on a large scale in the commercial market. In this paper, we report the use of CNTs for biomedical applications. The paper describes the distinct physical, electronic, and mechanical properties of nanotubes. The basics of synthesis and purification of CNTs are also reviewed. The challenges associated with CNTs, which remain to be fully addressed for their maximum utilization for biomedical applications, are discussed.

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New field-emission x-ray radiography system

Cited by 28 publications

References 9 publications

X-ray generation using carbon nanotubes

X-ray generation using carbon nanotubes

A carbon nanotube paste with high emission currnet for the X-ray tube

Carbon Nanotubes for Biomedical Applications

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