Study of the effect of magnetic field in positron range using GATE simulation toolkit

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dc.contributor.author Soultanidis, G en
dc.contributor.author Karakatsanis, N en
dc.contributor.author Nikiforidis, G en
dc.contributor.author Loudos, G en
dc.date.accessioned 2014-03-01T02:53:29Z
dc.date.available 2014-03-01T02:53:29Z
dc.date.issued 2011 en
dc.identifier.issn 17426588 en
dc.identifier.uri http://hdl.handle.net/123456789/36350
dc.subject.other Correction algorithms en
dc.subject.other Different-magnetic fields en
dc.subject.other Effect of magnetic field en
dc.subject.other Magnetic field line en
dc.subject.other Positron range en
dc.subject.other Simulation toolkits en
dc.subject.other Gallium en
dc.subject.other Isotopes en
dc.subject.other Magnetic fields en
dc.subject.other Monte Carlo methods en
dc.subject.other Nuclear medicine en
dc.subject.other Optimization en
dc.subject.other Positron annihilation en
dc.subject.other Rubidium en
dc.subject.other Electrons en
dc.title Study of the effect of magnetic field in positron range using GATE simulation toolkit en
heal.type conferenceItem en
heal.identifier.primary 10.1088/1742-6596/317/1/012021 en
heal.identifier.secondary http://dx.doi.org/10.1088/1742-6596/317/1/012021 en
heal.identifier.secondary 012021 en
heal.publicationDate 2011 en
heal.abstract In simultaneous PET-MR systems, the emitted positrons trajectory is influenced by the magnetic field. The aim of this study is to define that influence to the positron annihilation distribution. Monte Carlo methods have been applied, using GATE. Several isotopes were studied, in various types of materials and with different magnetic field strengths. The results showed variations in the positron range between different components and especially between the lung and water. Measurements of the 1-D positron annihilation distance indicated a reduction of the mean positron annihilation distance for82Rb of ∼25%,68Ga of 19% and18F of 3.5%, at 3 Tesla. When the magnetic field was increased to 9.5 Tesla, the reduction was significant for all isotopes, and mainly for68Ga and82Rb, with approximately 41% reduction of the mean positron annihilation distance in water. Finally, the positron annihilation distribution varies according to the alignment with the magnetic field lines. The results of this study could be used to improve positron annihilation correction algorithms for simultaneous PET-MR acquisition, by taking under consideration the non-isotropic distribution. © Published under licence by IOP Publishing Ltd. en
heal.journalName Journal of Physics: Conference Series en
dc.identifier.doi 10.1088/1742-6596/317/1/012021 en
dc.identifier.volume 317 en
dc.identifier.issue 1 en

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