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Quantitative imaging using high-energy X-ray phase-contrast CT with a 70 kVp polychromatic X-ray spectrum

Sarapata, A.; Willner, M.; Walter, M.; Duttenhofer, T.; Kaiser, K.; Meyer, P.; Braun, C.; Fingerle, A.; Noel, P.B.; Pfeiffer, F.; Herzen, J.

Abstract:
Imaging of large and dense objects with grating-based X-ray phase-contrast computed tomography requires high X-ray photon energy and large fields of view. It has become increasingly possible due to the improvements in the grating manufacturing processes. Using a high-energy X-ray phase-contrast CT setup with a large (10 cm in diameter) analyzer grating and operated at an acceleration tube voltage of 70 kVp, we investigate the complementarity of both attenuation and phase contrast modalities with materials of various atomic numbers (Z). We confirm experimentally that for low-Z materials, phase contrast yields no additional information content over attenuation images, yet it provides increased contrast-to-noise ratios (CNRs). The complementarity of both signals can be seen again with increasing Z of the materials and a more comprehensive material characterization is thus possible. Imaging of a part of a human cervical spine with intervertebral discs surrounded by bones and various soft tissue types showcases the benefit of high-energy X-ray phase-contrast system. Phase-contrast reconstruction reveals the internal structure of the discs and makes the boundary between the disc annulus and nucleus pulposus visible. ... mehr

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Volltext §
DOI: 10.5445/IR/110099998
Originalveröffentlichung
DOI: 10.1364/OE.23.000523
Scopus
Zitationen: 23
Web of Science
Zitationen: 25
Coverbild
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1094-4087
urn:nbn:de:swb:90-AAA1100999982
KITopen-ID: 110099998
HGF-Programm 43.23.02 (POF III, LK 01)
Erschienen in Optics express
Band 23
Seiten 523-535
Nachgewiesen in Web of Science
Scopus
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