000009303 001__ 9303 000009303 005__ 20141204092427.0 000009303 04107 $$aeng 000009303 046__ $$k12/05/2014 000009303 100__ $$aŽemlička, J. 000009303 24500 $$aEnergy sensitive X-ray imaging with pixel stack detector 000009303 24630 $$n18.$$pEngineering Mechanics 2012 000009303 260__ $$bInstitute of Theoretical and Applied Mechanics, AS CR, Prague 000009303 506__ $$arestricted 000009303 520__ $$2eng$$aMaterial decomposition based on dual energy X–ray radiography which was primarily developed for tissue differentiation in medical imaging can be favorably used for composite material examination. The principle of this method is obtaining several absorption images of the sample with different energy spectra which allows for the identification of main material components. The need of measurement at several X–ray spectra can be achieved either by alternation of the tube voltage and/or by the use of additional filters. The single photon counting pixel detector Medipix allows direct energy discrimination of registered radiation enabling spectrum selection at the detector side without the need to first modify the X–ray source spectrum. Our approach provides moreover low noise images with broad dynamic range and thus high sensitivity and enhanced contrast. Utilization of a 3D voxel detector with two or more sensor layers allows obtaining all required images simultaneously in a single exposure. The results of the material decomposition obtained with the Medipix detector are presented and discussed in this contribution. 000009303 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb. 000009303 653__ $$aenergy sensitive X–ray radiography, Medipix, signal to thickness calibration, material decomposition 000009303 7112_ $$aEngineering Mechanics 2012$$cSvratka (CZ)$$d12/05/2014 - 15/05/2014$$gEM2012 000009303 720__ $$aŽemlicka, J.$$iJakubek, J.$$iSoukup, P. 000009303 8560_ $$ffischerc@itam.cas.cz 000009303 8564_ $$s614303$$uhttps://invenio.itam.cas.cz/record/9303/files/310_Zemlicka_J-FT.pdf$$yOriginal version of the author's contribution as presented on CD, paper (No. 310). 000009303 962__ $$r8924 000009303 980__ $$aPAPER