Comparison of propagation-based phase-contrast tomography approaches for the evaluation of dentin microstructure

Hans Deyhle; Timm Weitkamp; Sabrina Lang; Georg Schulz; Alexander Rack; Irene Zanette; Bert Müller

doi:10.1117/12.929951

17 October 2012 Comparison of propagation-based phase-contrast tomography approaches for the evaluation of dentin microstructure

Hans Deyhle, Timm Weitkamp, Sabrina Lang, Georg Schulz, Alexander Rack, Irene Zanette, Bert Müller

Author Affiliations +

Proceedings Volume 8506, Developments in X-Ray Tomography VIII; 85060N (2012) https://doi.org/10.1117/12.929951
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

The complex hierarchical structure of human tooth hard tissues, enamel and dentin, guarantees function for decades. On the micrometer level the dentin morphology is dominated by the tubules, micrometer-narrow channels extending from the dentin-enamel junction to the pulp chamber. Their structure has been extensively studied, mainly with two-dimensional approaches. Dentin tubules are formed during tooth growth and their orientation is linked to the morphology of the nanometer-sized components, which is of interest for example for the development of bio-inspired dental fillings. Therefore, a method has to be identified that can access the three-dimensional organization of the tubules, e.g. density and orientation. Tomographic setups with pixel sizes in the sub-micrometer range allow for the three-dimensional visualization of tooth dentin tubules both in phase and absorption contrast modes. We compare high-resolution tomographic scans reconstructed with propagation based phase retrieval algorithms as well as reconstructions without phase retrieval concerning spatial and density resolution as well as rendering of the dentin microstructure to determine the approach best suited for dentin tubule imaging. Reasonable results were obtained with a single-distance phase retrieval algorithm and a propagation distance of about 75% of the critical distance of d²/λ, where d is the size of the smallest objects identifiable in the specimen and λ is the X-ray wavelength.

Citation Download Citation

Hans Deyhle, Timm Weitkamp, Sabrina Lang, Georg Schulz, Alexander Rack, Irene Zanette, and Bert Müller "Comparison of propagation-based phase-contrast tomography approaches for the evaluation of dentin microstructure", Proc. SPIE 8506, Developments in X-Ray Tomography VIII, 85060N (17 October 2012); https://doi.org/10.1117/12.929951

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