Comparison of single and dual layer detector blocks for pre-clinical MRI–PET

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DOIResolve DOI: http://doi.org/10.1016/j.nima.2012.07.062
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TypeArticle
Proceedings titleNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
ConferencePET/MR and SPECT/MR: New Paradigms for Combined Modalities in Molecular Imaging, May 26-30, 2012, ELBA Island, Italy
ISSN01689002
Volume702
Pages5658
SubjectPre-clinical PET; SiPM; Dual-layer pixelated detector
AbstractDual or multi-layer crystal blocks have been proposed to minimise the radial blurring effect in PET scanners with small ring diameters. We measured two potential PET detector blocks' performance in a configuration which would allow 16 blocks in a ring which could be inserted in a small animal 7T MRI scanner. Two crystal sizes, 1.60×1.60 mm² and 1.20×1.20 mm², were investigated. Single layer blocks had 10 or 12 mm deep crystals, the dual layer blocks had 4 mm deep crystals on the top layer and 6 mm deep crystals on the bottom layer. The crystals in the dual layer blocks are offset by ½ of the crystal pitch to allow for purely geometric crystal identification. Both were read out with SensL 4×4 SiPM arrays. The software identifies 64 crystals in the single layer and either 85 or 113 crystals in the dual layer array, (either 49 or 64 in the lower layers and 36 or 49 in the upper layers). All the crystals were clearly visible in the crystal identification images and their resolvability indexes (average FWHM/crystal separation) were shown to range from 0.29 for the best single layer block to 0.33 for the densest dual layer block. The best coincidence response FWHM was 0.95 mm for the densest block at the centre of the field. This degraded to 1.83 mm at a simulated radial offset of 16 mm from the centre, while the single layer crystals blurred this result to 3.4 mm. The energy resolution was 16.4±2.2% averaged over the 113 crystals of the densest block.
Publication date
LanguageEnglish
AffiliationMedical Devices; National Research Council Canada
Peer reviewedYes
IdentifierS0168900212008790
NPARC number21268829
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Record identifierf4b3e568-3348-49f9-82d9-fb2d039c35f4
Record created2013-11-14
Record modified2016-05-09
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