Numerical aspects in the development of two alternative methods for the detection of detal caries: Digital substraction radiography and a new method of spectroscopic Impedance Tomography (EIT).

Project Details


The apparent drop in the prevalence of dental caries, as it is observed in the current population, did not render the problem of clinical diagnosis less actual, on the contrary. A recent change in lesion morphology, together with the progressively increasing importance of recurrent caries, has made the assessment of carious involvement more problematic than ever before. The poor sensitivity of the current diagnostic techniques thereby calls for the study of alternative methods. In a parallel study*, two new diagnostic methods will be investigated, namely, a spectroscopic extension of Electrical Impedance Tomography (EIT), and a combination of intra-oral subtraction radiography with topical application of stannous fluoride. Despite being based on previously developed methods, this study differs from other research, both in its unique combination of methods, and the novel application of them to the problem of caries diagnosis. It is exactly this latter aspect, which not only will have a profound impact on the system design, but also will require extensive modifications to the existing signal processing algorithms. Rather than to address the aspect of signal processing in its entirety, the aim of the present research proposal is to localise some particular problems, and to investigate to what extent the application of advanced numerical concepts could improve the accuracy and efficacy of existing algorithms. The setting of this research will be that of numerical linear algebra, with a particular emphasis on the class of so-called subspace based algorithms. Numerical developments resulting from this research will be evaluated using in-vitro data obtained in the same parallel study.
Effective start/end date1/01/0231/12/05


  • radiography
  • inverse problems
  • numerical analysis
  • caries diagnosis
  • Electrical Impedance Tomography
  • dental
  • subtraction

Flemish discipline codes

  • Electrical and electronic engineering
  • Mathematical sciences
  • Basic sciences
  • (Bio)medical engineering