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

Soultanidis, G; Karakatsanis, N; Nikiforidis, G; Loudos, G

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	https://dspace.lib.ntua.gr/xmlui/handle/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