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Computation of CT-number and Z(eff) in teeth
1Department of Physics, Bangalore University, Bangalore 560056, Karnataka, India. manjunathhc@rediffmail.com
Health Physics
|April 1, 2011
Summary
This study calculated computerized tomography (CT) numbers and effective atomic number (Zeff) for tooth materials using WinXCOM. Results show constant Zeff values in a specific energy range, aiding medical diagnosis.
Area of Science:
- Dental materials science
- Medical physics
- Radiology
Background:
- Accurate characterization of dental tissues is crucial for diagnostic imaging.
- Understanding photon interactions within teeth informs radiation dosimetry and treatment planning.
Purpose of the Study:
- To compute and tabulate computerized tomography (CT) numbers and effective atomic number (Zeff) for various tooth components.
- To analyze these values across a wide photon energy range (1 keV-100 GeV).
Main Methods:
- Utilized the WinXCOM computer program for direct calculation of photon interactions.
- Calculated CT numbers and Zeff for enamel and dentin at different depths.
- Investigated Zeff constancy in the 500 keV to 1.5 MeV energy range.
Main Results:
- Computed CT numbers and Zeff values for enamel outer surface, enamel middle, enamel dentin junction (towards enamel and dentin), dentin middle, and dentin inner surface.
- Observed an almost constant Zeff across all tooth materials between 500 keV and 1.5 MeV.
- Tabulated computed CT numbers and Zeff sums.
Conclusions:
- The computed CT numbers are valuable for medical diagnosis in dentistry.
- The study provides insights into the dosimetric implications of the mass attenuation coefficient in teeth.
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