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Phase-contrast x-ray imaging with a liquid-metal-jet-anode microfocus source
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Biomedicinsk fysik och röntgenfysik.
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Biomedicinsk fysik och röntgenfysik.
KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Biomedicinsk fysik och röntgenfysik.ORCID-id: 0000-0003-2723-6622
2007 (engelsk)Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 91, nr 7, s. 074104-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Phase-contrast methods increase contrast, detail, and selectivity in x-ray imaging. Present compact x-ray sources do not provide the necessary spatial coherence with sufficient power to allow the laboratory-scale high-resolution phase-contrast imaging with adequate exposure times. In this letter, the authors demonstrate phase-contrast imaging with few-micron detail employing a compact similar to 6.5 mu m spot liquid-metal-jet-anode high-brightness microfocus source. The 40 W source is operated at more than ten times higher electron-beam power density than present microfocus sources and is shown to provide sufficient spatial coherence as well as scalability to high power, thereby enabling the application of phase-contrast x-ray imaging with short exposure times in clinics and laboratories.

sted, utgiver, år, opplag, sider
2007. Vol. 91, nr 7, s. 074104-
Emneord [en]
Coherent light, Electron beams, Luminance, Optical resolving power, Electron-beam power density, Phase-contrast x-ray imaging, Spatial coherence
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-8665DOI: 10.1063/1.2769760ISI: 000248866600120Scopus ID: 2-s2.0-34548008161OAI: oai:DiVA.org:kth-8665DiVA, id: diva2:14046
Merknad
QC 20100915Tilgjengelig fra: 2008-06-04 Laget: 2008-06-04 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. Liquid-Jet-Target Microfocus X-Ray Sources: Electron Guns, Optics and Phase-Contrast Imaging
Åpne denne publikasjonen i ny fane eller vindu >>Liquid-Jet-Target Microfocus X-Ray Sources: Electron Guns, Optics and Phase-Contrast Imaging
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This Thesis describes the development of an electron-impact microfocus x-ray source and its application for phase-contrast imaging. The source is based on a novel, liquid-jet target concept. Stable and continuous operation can be achieved at substantially higher electron-beam power densities than conventional solid target based systems. The maximum x-ray brightness can potentially be increased by a factor of 10-1000, which would provide significantly improved performance in applications such as imaging. In order to reach the high x-ray brightness, comparable performance from the electron gun is needed. A LaB6-cathode-based electron gun is analyzed in terms of achievable e-beam brightness and beam quality and is found capable to deliver power densities in the 10-100 MW/mm2 range using optimized electro-optics. A proof-of-principle microfocus source has been developed. Experiments show that the liquid-metal-jet target can be operated at more than an order of magnitude higher e-beam power densities than modern solid-metal targets. This brightness enhancement has been utilized to acquire in-line phase-contrast images of weakly absorbing objects. The source potentially enables the application of high-resolution phase-contrast x-ray imaging with short exposure times in clinics and laboratories.

Different liquid-jet-target materials have been tested. The Sn-jet (Ka=25.3 keV) could be suitable for mammography, whereas the Ga-jet ((Ka=9.2 keV) may be utilized for x-ray diffraction studies. In addition, a non-metallic methanol jet has been the demonstrated in stable x-ray operation. All materials and compounds found in liquid form can, thus, potentially be used for electron-impact liquid-jet-target x-ray generation.

Scaling to higher e-beam power density and x-ray brightness levels is discussed and is determined to be feasible. Potential difficulties, such as debris emission and instabilities of the x-ray emission spot, are investigated in some detail. Larger and/or faster jets could overcome the present limitations because of their inherently higher heat load capacities. Dynamic-similarity experiments show that liquid jets can in principle be operated in a stable manner at much higher speeds than previously shown.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2008. s. x, 91
Serie
Trita-FYS, ISSN 0280-316X ; 2008:12
Emneord
electron-impact, x-ray, brightness, liquid-jet-target, phase-contrast imaging
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4802 (URN)978-91-7415-004-9 (ISBN)
Disputas
2008-06-13, FR4, Albanova, Roslagstullsbacken 21, Stockholm, 14:00 (engelsk)
Opponent
Veileder
Merknad
QC 20100915Tilgjengelig fra: 2008-06-04 Laget: 2008-06-04 Sist oppdatert: 2010-09-15bibliografisk kontrollert

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