Characterization of a human tooth with carious lesions using conventional and synchrotron radiation-based micro computed tomography

Iwona Dziadowiec; Felix Beckmann; Georg Schulz; Hans Deyhle; Bert Müller

doi:10.1117/12.2060574

12 September 2014 Characterization of a human tooth with carious lesions using conventional and synchrotron radiation-based micro computed tomography

Iwona Dziadowiec, Felix Beckmann, Georg Schulz, Hans Deyhle, Bert Müller

Author Affiliations +

Proceedings Volume 9212, Developments in X-Ray Tomography IX; 92120W (2014) https://doi.org/10.1117/12.2060574
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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.

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Iwona Dziadowiec, Felix Beckmann, Georg Schulz, Hans Deyhle, and Bert Müller "Characterization of a human tooth with carious lesions using conventional and synchrotron radiation-based micro computed tomography", Proc. SPIE 9212, Developments in X-Ray Tomography IX, 92120W (12 September 2014); https://doi.org/10.1117/12.2060574

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