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dc.contributor.authorUche, Chibueze Zimuzo
dc.contributor.authorRound, W. Howell
dc.contributor.authorCree, Michael J.
dc.date.accessioned2011-03-21T02:50:40Z
dc.date.available2011-03-21T02:50:40Z
dc.date.issued2011
dc.identifier.citationUche, C., Round, W.H. & Cree, M.J. (2011). Effects of energy threshold and dead time on Compton camera performance. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, available online 9 March 2011.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/5184
dc.description.abstractWe study the effects of energy threshold and dead time on the sensitivity and image resolution of the Compton camera. The simulation model includes the decay times, detection time jitters, energy threshold and detector dead time as well as basic detector parameters such as Doppler broadening, energy resolution and finite detector resolution. The GEANT4 toolkit was used to model the camera geometry and performance for two common nuclear medicine energies that correspond to 99mTc (140.5 keV) and ¹⁸F (511 keV) radiotracers. Results without the energy threshold and time effects show good agreement with previous studies. For 140.5 keV, the inclusion of energy threshold improved image resolution from 10.7 to 9.5 mm with a source-to-detector distance of 5 cm, while the inclusion of time effects made no further difference on resolution. The energy threshold reduced the sensitivity by 48%, and subsequent inclusion of time effects further reduced the sensitivity by 17%. At 511 keV, the application of energy threshold reduced the sensitivity by 6%, while the time effects dominated count rate losses with further reduction of 13%. However, the inclusion of the two effects had negligible impact on the resolution.en_NZ
dc.language.isoen
dc.publisherElsevier BVen_NZ
dc.subjectCompton cameraen_NZ
dc.subjectdead timeen_NZ
dc.subjectenergy thresholden_NZ
dc.subjectdetectoren_NZ
dc.subjectGEANT4en_NZ
dc.titleEffects of energy threshold and dead time on Compton camera performanceen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1016/j.nima.2011.03.004en_NZ
dc.relation.isPartOfNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipmenten_NZ
pubs.begin-page114en_NZ
pubs.edition11th Juneen_NZ
pubs.elements-id35800
pubs.end-page120en_NZ
pubs.issue1en_NZ
pubs.volume641en_NZ


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