Spektr: A computational tool for x-ray spectral analysis and imaging system optimization

J. H. Siewerdsen, A. M. Waese, D. J. Moseley, S. Richard, D. A. Jaffray

Research output: Contribution to journalArticlepeer-review

234 Scopus citations


A set of computational tools are presented that allow convenient calculation of x-ray spectra, selection of elemental and compound filters, and calculation of beam quality characteristics, such as half-value layer, mR/mAs, and fluence per unit exposure. The TASMIP model of Boone and Seibert is adapted to a library of high-level language (Matlab™) functions and shown to agree with experimental measurements across a wide range of kVp and beam filtration. Modeling of beam filtration is facilitated by a convenient, extensible database of mass and mass-energy attenuation coefficients compiled from the National Institute of Standards and Technology. The functions and database were integrated in a graphical user interface and made available online at http:// www.aip.org/epaps/epaps.html. The functionality of the toolset and potential for investigation of imaging system optimization was illustrated in theoretical calculations of imaging performance across a broad range of kVp, filter material type, and filter thickness for direct and indirect-detection flat-panel imagers. The calculations reveal a number of nontrivial effects in the energy response of such detectors that may not have been guessed from simple K-edge filter techniques, and point to a variety of compelling hypotheses regarding choice of beam filtration that warrant future investigation.

Original languageEnglish (US)
Pages (from-to)3057-3067
Number of pages11
JournalMedical physics
Issue number11
StatePublished - Nov 2004
Externally publishedYes


  • Cascaded systems analysis
  • Detective quantum efficiency
  • Flat-panel imager
  • Imaging performance
  • Optimization
  • Spectral modeling
  • X-ray spectrum

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging


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