Energy-resolved Compton scatter estimation for micro-CT

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dc.contributor.authorOpie, A.M.T.
dc.contributor.authorButler, A.P.H.
dc.contributor.authorBones, P.J.
dc.date.accessioned2012-11-20T02:12:44Z
dc.date.available2012-11-20T02:12:44Z
dc.date.issued2012en
dc.description.abstractX-ray scatter can cause significant distortion in CT imaging especially with the move to cone-beam geometries. Incoherent scatter (Compton scatter) is known to reduce the energy of scattered photons according to the angle of the scattering. The emergence of energy-resolved x-ray detectors offers an opportunity to produce and apply more accurate scatter estimates leading to improved image quality. We have developed a scatter estimation algorithm that accounts for the variation in scatter with incident radiation energy. Where existing methods generate estimates of scatter for the complete detected energy band, our new method produces separate estimates for each of the energy bands that are measured allowing a more focused correction of scatter. Our method is intended to be used in an iterative compensation framework like that of Ruhrnschopf and Klingenbeck (2011); it calculates the scatter contribution to each energy bin used in a scan based on the current volume estimate. Comparisons with Monte Carlo simulations indicate that this algorithm is effective at estimating the scatter level in separate energy bins. We found that the amount of scatter that loses enough energy to hop between energy bands is small enough to neglect but that scatter intensity is dependent on the incident energy so application of a spectrally-aware compensation technique is valuable.en
dc.identifier.citationOpie, A.M.T., Butler, A.P.H., Bones, P.J. (2012) Energy-resolved Compton scatter estimation for micro-CT. San Diego, CA, USA: Developments in X-Ray Tomography VIII, 13-15 Aug 2012. Proceedings of the SPIE, 8506, 850616.en
dc.identifier.urihttp://hdl.handle.net/10092/7181
dc.language.isoen
dc.publisherUniversity of Canterbury. Electrical and Computer Engineeringen
dc.publisherUniversity of Canterbury. Human Interface Technology Laboratoryen
dc.rightsCopyright 2012 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.en
dc.rights.urihttps://hdl.handle.net/10092/17651en
dc.subjectComptonen
dc.subjectscatteren
dc.subjectestimationen
dc.subjectspectralen
dc.subjectmicro-CTen
dc.subjectenergy-resolveden
dc.subject.anzsrcField of Research::11 - Medical and Health Sciences::1103 - Clinical Sciences::110320 - Radiology and Organ Imagingen
dc.subject.anzsrcFields of Research::32 - Biomedical and clinical sciences::3206 - Medical biotechnology::320602 - Medical biotechnology diagnostics (incl. biosensors)en
dc.subject.anzsrcFields of Research::51 - Physical sciences::5105 - Medical and biological physics::510502 - Medical physicsen
dc.titleEnergy-resolved Compton scatter estimation for micro-CTen
dc.typeConference Contributions - Published
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