Depth identification accuracy of a three layer phoswich PET detector module

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Show simple item record Seidel, Jürgen Vaquero López, Juan José Siegel, Stefan Gandler, William R. Green, Michael V. 2012-06-14T08:42:14Z 2012-06-14T08:42:14Z 1999-06
dc.identifier.bibliographicCitation IEEE Transcations on Nuclear Science, vol. 46, n. 3, jun. 1999. Pp. 485-490
dc.identifier.issn 0018-9499
dc.description.abstract We describe a PET detector module that provides three levels of depth-of-interaction (DOI) information. The detector is a 9 x 9 array of 2 mm x 2 mm x 12 mm deep phoswich crystal elements, each consisting of 4 mm long LSO (entrance layer), GSO (middle layer) and BGO (exit layer) crystals joined optically together end-to-end. The BGO exit layer is directly coupled to a miniature position-sensitive photomultiplier tube (PSPMT). Delayed charge integration, a method that exploits differences in the light decay times of these scintillators, is used to determine the layer-of-interaction. DO1 accuracy, measured by scanning a slit source of 5 1 1 keV radiation along the length of the module was 86% for the LSO layer, 80% for the GSO layer and 84% for the BGO layer. Energy resolution at 511 keV was 19% for LSO, 21% for GSO and 40% for BGO. Apparent gain differed between layers in the ratios 2.7: 1.9: 1 .O (LS0:GSO:BGO). Crystal separation was good between crystals in the LSO layer, acceptable between crystals in the GSO layer and poor between crystals in the BGO layer due, primarily, to the pronounced spatial non-linearity of the PSPMT. The delayed charge integration method, however, does appear suitable for obtaining multi-level depth information when DO1 effects are particularly significant, e.g. in very small ring diameter PET scanners for small animal imaging.
dc.description.sponsorship Was supported, in part, by a grant from CICYT (Spanish Government). S. S. was supported by a grant from the National Research Council.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher IEEE
dc.rights © IEEE
dc.title Depth identification accuracy of a three layer phoswich PET detector module
dc.type article
dc.description.status Publicado
dc.subject.eciencia Biología y Biomedicina
dc.identifier.doi 10.1109/23.775567
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 485
dc.identifier.publicationissue n. 3
dc.identifier.publicationlastpage 490
dc.identifier.publicationtitle IEEE Transcations on Nuclear Science
dc.identifier.publicationvolume vol. 46
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