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SUMMARY:Dual Energy X-ray Analysis Using Synchrotron Computed Tomography a
 t 35–60 keV
DTSTART;VALUE=DATE-TIME:20141121T010500Z
DTEND;VALUE=DATE-TIME:20141121T012500Z
DTSTAMP;VALUE=DATE-TIME:20260419T083754Z
UID:indico-contribution-772@events01.synchrotron.org.au
DESCRIPTION:Speakers: Stewart Midgley (School of Physics\, Monash Universi
 ty)\nDual energy X-ray analysis (DEXA) uses CT measurements of the X-ray l
 inear attenuation coefficient at two photon energies to characterise mater
 ials\; electron density and statistical measure of elemental composition\,
  related to the concept of effective atomic number.\n \nPhantoms were prep
 ared as liquid samples of known density and composition including ethanol-
 water mixtures and salt solutions (NaCl\, NaH2PO4\, MgCl2\, MgSO4\, KCl\, 
 KH2PO4 and CaCl2). The phantoms and an ex-vivo laboratory animal underwent
  mono-energetic CT at 35–60 keV using the Australian Synchrotron Imaging
  and Medical beamline and a CCD camera optically coupled to a luminescent 
 screen.\n\nThe CT data for the phantoms provided coefficients that describ
 e attenuation as measured by the beamline\, and expressed as elemental cro
 ss-sections. The phantom data underwent DEXA\, and the accuracy of the ana
 lysis was quantified as a function of mean beam energy\, dual energy separ
 ation\, and elemental composition. The CT data for ex-vivo samples was spa
 tially co-registered\, subjected to DEXA\, and the results were used to cr
 eate volumetric maps representing the X-ray linear attenuation coefficient
 s and energy absorption coefficients for photon energies of 10 keV to 10 M
 eV.\n\nThe DEXA technique was successfully demonstrated using samples of k
 nown density and composition\, and factors that affect accuracy were ident
 ified. An important application of the method\, the prediction of photon i
 nteraction coefficients at other beam energies for attenuation correction 
 and radiation dose calculations\, was investigated for the biological spec
 imen.\n\nhttps://events01.synchrotron.org.au/event/3/contributions/772/
LOCATION: Conference Room AS
URL:https://events01.synchrotron.org.au/event/3/contributions/772/
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