Optimal frequency-based weighting for spectral x-ray projection imaging
2015 (English)In: IEEE Transactions on Medical Imaging, ISSN 0278-0062, E-ISSN 1558-254X, Vol. 34, no 3, 779-787 p.Article in journal (Refereed) Published
The purpose of this work is to derive a weighting scheme that maximizes the frequency-dependent ideal observer signal-difference-to-noise ratio, commonly referred to as detectability index or Hotelling-SDNR, for spectral X-ray projection imaging. Starting from basic statistical decision theory, optimal frequency-dependent weights are derived for a multiple-bin system and the Hotelling-SDNR calculated. A 28% increase in detectability index is found for high frequency objects when applying optimal frequency-dependent weights instead of pixel-based weights to a simplified model of a silicon detector, decreasing towards 0% for low frequency objects. Simulation results indicate a potentially large increase in detectability for high-frequency object imaging using silicon detectors, thus meriting further evaluations on a real system.
Place, publisher, year, edition, pages
2015. Vol. 34, no 3, 779-787 p.
Other Physics Topics
Research subject Medical Technology
IdentifiersURN: urn:nbn:se:kth:diva-160897DOI: 10.1109/TMI.2014.2360932ISI: 000350870700010ScopusID: 2-s2.0-84923873993OAI: oai:DiVA.org:kth-160897DiVA: diva2:792111
QC 201503032015-03-032015-03-032015-04-13Bibliographically approved