A compact X-ray microtomography system for element mapping and absorption imaging

Feldkamp, J.M.; Dieckmann, M.; Schröder, W. H.; Schroer, C. G.; Schweitzer, M.; Stenzel, C.; Patommel, J.; Günzler, T. F.; Lengeler, B.

doi:10.1063/1.2751094

Journal Article

A compact X-ray microtomography system for element mapping and absorption imaging

Feldkamp, J. M. ; Schroer, C. G. ; Patommel, J. ; Lengeler, B. ; Günzler, T. F. ; Schweitzer, M. ; Stenzel, C. ; Dieckmann, M. ; Schröder, W. H.FZJ*

2007
American Institute of Physics [S.l.]

Review of scientific instruments 78, 073702-01 - 077302-8 (2007) [10.1063/1.2751094]

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Please use a persistent id in citations: http://hdl.handle.net/2128/3145 doi:10.1063/1.2751094

Abstract: We have designed and built a compact x-ray microtomography system to perform element mapping and absorption imaging by exploiting scanning fluorescence tomography and full-field transmission microtomography, respectively. It is based on a low power microfocus tube and is potentially appropriate for x-ray diagnostics in space. Full-field transmission tomography yields the three-dimensional inner structure of an object. Fluorescence microtomography provides the element distribution on a virtual section through the sample. Both techniques can be combined for appropriate samples. Microradiography as well as fluorescence mapping are also possible. For fluorescence microtomography a small and intensive microbeam is required. It is generated using a polycapillary optic. Operating the microfocus tube with a molybdenum target at 12 W, a microbeam with a full width at half maximum lateral extension of 16 microm and a flux of about 10(8) photonss is generated. As an example of application, this beam is used to determine the element distribution inside dried plant samples. For full-field scanning tomography, the x-ray optic is removed and the sample is imaged in magnifying projection onto a two-dimensional position sensitive detector. Depending on the sample size, a spatial resolution down to about 10 microm is possible in this mode. The method is demonstrated by three-dimensional imaging of a rat humerus.

Keyword(s): Absorptiometry, Photon: instrumentation (MeSH) ; Absorptiometry, Photon: methods (MeSH) ; Equipment Design (MeSH) ; Equipment Failure Analysis (MeSH) ; Miniaturization (MeSH) ; Reproducibility of Results (MeSH) ; Sensitivity and Specificity (MeSH) ; Tomography, X-Ray: instrumentation (MeSH) ; J