X-ray spectra estimation using attenuation measurements from 25 kVp to 18 MV

Robert G. Waggener, Melissa M. Blough, James A. Terry, Di Chen, Nina E. Lee, Sean Zhang, William D. McDavid

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Attenuation measurements for primary x-ray spectra from 25 kVp to 18 MV were made using aluminum filters for all energies except for orthovoltage where copper filters were used. An iterative perturbation method, which utilized these measurements, was employed to derive the apparent x-ray spectrum. An initial spectrum or pre-spectrum was used to start the process. Each energy value of the pre-spectrum was perturbed positively and negatively, and an attenuation curve was calculated using the perturbed values. The value of x-rays in the given energy bin was chosen to minimize the difference between the measured and calculated transmission curves. The goal was to derive the minimum difference between the measured transmission curve and the calculated transmission curve using the derived x-ray spectrum. The method was found to yield useful information concerning the lower photon energy and the actual operating potential versus the nominal potential. Mammographic, diagnostic, orthovoltage, and megavoltage x-ray spectra up to 18 MV nominal were derived using this method. The method was validated using attenuation curves from published literature. The method was also validated using attenuation curves calculated from published spectra. The attenuation curves were then used to derive the x-ray spectra.

Original languageEnglish (US)
Pages (from-to)1269-1278
Number of pages10
JournalMedical Physics
Volume26
Issue number7
DOIs
StatePublished - Jul 1999

Fingerprint

X-Rays
Aluminum
Photons
Copper

Keywords

  • Attenuation curves
  • Diagnostic
  • Mammography
  • Megavoltage
  • Spectra

ASJC Scopus subject areas

  • Biophysics

Cite this

Waggener, R. G., Blough, M. M., Terry, J. A., Chen, D., Lee, N. E., Zhang, S., & McDavid, W. D. (1999). X-ray spectra estimation using attenuation measurements from 25 kVp to 18 MV. Medical Physics, 26(7), 1269-1278. https://doi.org/10.1118/1.598622

X-ray spectra estimation using attenuation measurements from 25 kVp to 18 MV. / Waggener, Robert G.; Blough, Melissa M.; Terry, James A.; Chen, Di; Lee, Nina E.; Zhang, Sean; McDavid, William D.

In: Medical Physics, Vol. 26, No. 7, 07.1999, p. 1269-1278.

Research output: Contribution to journalArticle

Waggener, RG, Blough, MM, Terry, JA, Chen, D, Lee, NE, Zhang, S & McDavid, WD 1999, 'X-ray spectra estimation using attenuation measurements from 25 kVp to 18 MV', Medical Physics, vol. 26, no. 7, pp. 1269-1278. https://doi.org/10.1118/1.598622
Waggener RG, Blough MM, Terry JA, Chen D, Lee NE, Zhang S et al. X-ray spectra estimation using attenuation measurements from 25 kVp to 18 MV. Medical Physics. 1999 Jul;26(7):1269-1278. https://doi.org/10.1118/1.598622
Waggener, Robert G. ; Blough, Melissa M. ; Terry, James A. ; Chen, Di ; Lee, Nina E. ; Zhang, Sean ; McDavid, William D. / X-ray spectra estimation using attenuation measurements from 25 kVp to 18 MV. In: Medical Physics. 1999 ; Vol. 26, No. 7. pp. 1269-1278.
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