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Proceedings Paper

Characterization of a human tooth with carious lesions using conventional and synchrotron radiation-based micro computed tomography
Author(s): Iwona Dziadowiec; Felix Beckmann; Georg Schulz; Hans Deyhle; Bert Müller
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Paper Abstract

In a dental office, every day X rays of teeth within the oral cavity are obtained. Caries induces a mineral loss and, therefore, becomes visible by reduced X-ray absorption. The detailed spatial distribution of the mineral loss, however, is inaccessible in conventional dental radiology, since the dose for such studies is intolerable. As a consequence, such measurements can only be performed after tooth extraction. We have taken advantage of synchrotron radiation-based micro computed tomography to characterize a human tooth with a rather small, natural caries lesion and an artificially induced lesion provoked by acidic etching. Both halves of the tooth were separately visualized from 2400 radiographs recorded at the beam line P07 / PETRA III (HASYLAB at DESY, Hamburg, Germany) with an asymmetric rotation axis at photon energy of 45 keV. Because of the setup, one finds an energy shift in the horizontal plane, to be corrected. After the appropriate three-dimensional registration of the data with the ones of the same crown using the better accessible phoenix nanotom® m of General Electric, Wunstorf, Germany, one can determine the joint histogram, which enable to calibrate the system with the conventional X-ray source.

Paper Details

Date Published: 12 September 2014
PDF: 7 pages
Proc. SPIE 9212, Developments in X-Ray Tomography IX, 92120W (12 September 2014); doi: 10.1117/12.2060574
Show Author Affiliations
Iwona Dziadowiec, Univ. Hospital Basel (Switzerland)
Felix Beckmann, Helmholtz-Zentrum Geesthacht (Germany)
Georg Schulz, Univ. Hospital Basel (Switzerland)
Hans Deyhle, Univ. Hospital Basel (Switzerland)
Bert Müller, Univ. Hospital Basel (Switzerland)

Published in SPIE Proceedings Vol. 9212:
Developments in X-Ray Tomography IX
Stuart R. Stock, Editor(s)

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