Comparison of five methods for the derivation of spectra for a constant potential dental X-ray unit

B. R. Lankipalli, W. D. McDavid, S. B. Dove, E. Wieckowska, R. G. Waggener, J. R. Mercier

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Objectives: To compare the diagnostic X-ray spectra derived by different methods for a constant potential dental X-ray unit. Materials and methods: Five methods of deriving X-ray spectra for a constant potential dental X-ray unit were compared: measurement by spectrometer using cadmium-zinc-telluride (CZT) detector, calculation by Monte Carlo simulation, calculation by two different, semi-empirical methods and estimation from transmission data. The dental X-ray set was a Heliodent MD unit (Sirona, Charlotte, NC, USA) operable at 60 or 70 kV. A semiconductor detector was used in the spectrometer measurements and an ionization chamber dosimeter in the transmission measurements. From the five methods, photon-fluence spectra were derived. Based on the photon-fluence spectra, average energies and transmission curves in aluminum were calculated. Results: For all five methods, the average energies were within 2.4% of one another. Comparison of the transmission curves showed an average difference in the range of 1 to 6%. Conclusion: All of the five methods of deriving spectra are in extremely good agreement with each other.

Original languageEnglish (US)
Pages (from-to)264-269
Number of pages6
JournalDentomaxillofacial Radiology
Issue number5
StatePublished - Dec 1 2001


  • Radiography
  • Radiography, dental
  • X-rays

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Radiology Nuclear Medicine and imaging
  • Dentistry(all)


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