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Feasibility of local CT of dental tissues

AN van Daatselaar^*,1, SM Dunn², HJW Spoelder^,3, DM Germans³, L Renambot⁴, HE Bal^3,4 and PF van der Stelt¹

¹ Department of Oral Radiology, Academic Centre for Dentistry Amsterdam (ACTA), Amsterdam, The Netherlands; ² Department of Medical Engineering, Rutgers University, New Jersey, USA; ³ Physics Applied Computer Science, Division of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, Amsterdam, The Netherlands; ⁴ Division of Mathematics and Computer Science, Faculty of Sciences, Vrije Universiteit, Amsterdam, The Netherlands

*Correspondence to: AN van Daatselaar, Department of Oral Radiology, Academic Center for Dentistry Amsterdam (ACTA), Louwesweg 1, 1066EA Amsterdam, The Netherlands; Email: a.v.daatselaar{at}acta.nl

Received 26 November 2002; revised 7 March 2003; accepted 25 June 2003

Objectives: To prove the feasibility of a local CT system as a method of CT suitable for use in dentistry.

Methods: Using an experimental set-up consisting of an X-ray source, a turntable and a charge-coupled device (CCD) detector connected to a PC, CT scans were made of a single molar and a dry mandible. Slices were reconstructed using filtered backprojection. An experimental comparison was made between a full CT geometry and a local CT geometry.

Results: Horizontal and vertical slices through the mandible were obtained showing the internal structure of a molar and the surrounding bone. The slices show good contrast and details. A computer experiment gave visual evidence that slices obtained by local CT are not substantially different from slices obtained from a full CT set-up with respect to resolution.

Conclusions: Based on the results obtained so far, local CT of dental structures appears to be a promising diagnostic instrument.

Keywords: tomography, X-ray computed; local CT; digital radiography; image reconstruction

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