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dc.contributor.authorCot Sanz, Alberto
dc.contributor.authorJané, E
dc.contributor.authorSempau Roma, Josep
dc.contributor.authorFalcón, C
dc.contributor.authorBullich, S
dc.contributor.authorPavía, J
dc.contributor.authorCalviño Tavares, Francisco
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear
dc.contributor.otherUniversitat Politècnica de Catalunya. Institut de Tècniques Energètiques
dc.date.accessioned2011-01-26T10:11:34Z
dc.date.available2011-01-26T10:11:34Z
dc.date.created2006-02
dc.date.issued2006-02
dc.identifier.citationCot, A. [et al.]. Modeling of high-energy contamination in SPECT Imaging using Monte Carlo Simulation. "IEEE transactions on nuclear science", Febrer 2006, vol. 53, núm. 1, p. 198-203.
dc.identifier.issn0018-9499
dc.identifier.urihttp://hdl.handle.net/2117/11210
dc.description.abstractI is a commonly used radioisotope employed in neurotransmitter SPECT studies. In addition to an intense line at 159 keV, the decay scheme of this radioisotope includes a low yield ( 3%) of higher energy photons which make a non-negligible contribution to the final image when low-energy high-resolution (LEHR) collimators are used. This contribution of high-energy photons may reach 28% of the total counts in the projections. The aim of this work is to model each energy component of the high-energy Point Spread Function (hPSF) for fan-beam LEHR collimators in order to develop fast Monte Carlo (MC) simulations of high-energy ray contamination. The modeling of hPSF was based on the results of simulating photons through the collimator-detector system using the MC code PENELOPE. Since low-energy PSFs models for fan-beam collimators tend to a Gaussian distribution, we use the same function for the hPSF modeling for high-energy photons. The parameters of these Gaussian functions ( ( )) were obtained by minimizing the root mean square error (RMS) using the sensitivity of the simulated hPSFs as a constraint. The hPSFs were parameterized for a range of energies between 350 keV and 538 keV. The RMS attained after fitting of ( ) to the simulated hPSFs was always smaller than 2% of the mean sensitivity per pixel of the image. A strong dependence of the sensitivity on the type and thickness of the backscatter material behind the crystal was found. Our results indicate that Gaussian distributions approximate the hPSF responses for fan-beam collimators. This model will be an important tool to accelerate MC simulations of radiolabeled compounds which emit medium- or high-energy rays.
dc.format.extent6 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Energies::Tecnologia energètica
dc.subject.lcshMonte Carlo method
dc.titleModeling of high-energy contamination in SPECT Imaging using Monte Carlo Simulation
dc.typeArticle
dc.subject.lemacMonte Carlo, Mètode de
dc.contributor.groupUniversitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions
dc.identifier.doi10.1109/TNS.2006.870174
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
local.identifier.drac1229689
dc.description.versionPostprint (published version)
local.citation.authorCot, A.; Jané, E.; Sempau, J.; Falcón, C.; Bullich, S.; Pavía, J.; Calviño, F.
local.citation.publicationNameIEEE transactions on nuclear science
local.citation.volume53
local.citation.number1
local.citation.startingPage198
local.citation.endingPage203


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