IADR Abstract Archives

CBCT Compared to Ultra-High Resolution Photon-Counting CT for Dental Imaging

Objectives: Volumetric imaging of dental structures usually requires a spatial resolution that cannot be achieved by conventional clinical computed tomography (CT) systems but is available in dedicated cone-beam CT systems (CBCT). Novel clinical photon-counting (PC) CTs offer a spatial resolution of about 200 µm and might allow for acquisitions close to conventional dental CBCTs with the added benefits of increased soft tissue contrast and high scan speeds. Herein, the capabilities of these new system in comparison to state-of-the-art dental CBCTs shall be evaluated.
Methods: Acquisitions of 5 cadaveric heads were performed in an experimental CT system (SOMATOM CounT, Siemens Healthineers, Germany) containing an ultra-high resolution PC detector (0.25 mm pixel size) as well as in a dental CBCT scanner (Veraview X800, Morita, Japan). Acquisitions were performed using a tube voltage of 120 kV and varying dose levels between 4 mGy and 50 mGy (CTDI16cm) in case of PCCT and using 102 kV in case of the CBCT and a dose of 1397 mGycm2. Image reconstruction was performed with an isotropic voxel size of 0.125 mm in case of CBCT and 0.134 mm in case of PCCT. Quality of delineation of gingiva, hard tissues, periodontal space as well as apical osteolysis were used as figures of merit for comparison of both technologies and were assessed by two readers using a five-point rating scale (1=excellent,2=good,3=moderate,4=poor,5=not visible).
Results: Apical osteolysis, periodontal space as well as enamel, dentine, pulp-chamber and gingiva identified in CBCT were found in all PCCT reconstructions. Both devices showed excellent image quality of all structures assessed. A reduction of dose to 4 mGy still allowed for distinct identification of osteolytic foci, enamel, dentine, pulp-chamber, periodontal space and gingiva in PCCT acquisitions.
Conclusions: Ultra-high resolution PCCT is able to reliably identify different diagnostic entities and structures relevant for dental diagnostics similar to conventional dental CBCT.

2021 Continental European and Scandinavian Divisions Meeting (Brussels, Belgium, Hybrid)
Brussels, Belgium, Hybrid
2021
0243
Diagnostic Sciences
  • Sawall, Stefan  ( German Cancer Research Center (DKFZ) , Heidelberg , Germany )
  • Ruetters, Maurice  ( Heidelberg University Hospital , Heidelberg , Germany )
  • Sen, Sinan  ( Heidelberg University Hospital , Heidelberg , Germany )
  • Gehrig, Holger  ( Heidelberg University Hospital , Heidelberg , Germany )
  • Kim, Ti-sun  ( Heidelberg University Hospital , Heidelberg , Germany )
  • Lux, Christopher  ( Heidelberg University Hospital , Heidelberg , Germany )
  • Schlemmer, Heinz-peter  ( German Cancer Research Center (DKFZ) , Heidelberg , Germany )
  • Heinze, Sarah  ( Heidelberg University Hospital , Heidelberg , Germany )
  • Maier, Joscha  ( German Cancer Research Center (DKFZ) , Heidelberg , Germany )
  • Kachelriess, Marc  ( German Cancer Research Center (DKFZ) , Heidelberg , Germany )
  • None
    Poster Session ALL VIRTUAL
    Diagnostics