Evaluation of very highly pixellated crystal blocks with SiPM readout as candidates for PET/MR detectors in a small animal PET insert

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DOIResolve DOI: http://doi.org/10.1109/NSSMIC.2012.6551717
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TypeArticle
Proceedings titleNuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE
IEEE Nuclear Science Symposium conference record
Conference2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record, NSS/MIC 2012, October 29 - November 3, 2012, Anaheim, CA, USA
ISSN1095-7863
ISBN9781467320306
9781467320290
1467320293
Article number6551717
Pages31413145; # of pages: 5
Subjectpositron emission tomography; silicon photo-multiplier; small animal PET insert for MRI scanner
AbstractArrays of silicon photo-multipliers (SiPMs) are good candidates for the readout of detectors in PET MR inserts due to their high packing density, efficiency, low bias voltage and insensitivity to magnetic fields. In this study we report the readout performance of SensL SiPM arrays in terms of their ability to resolve all elements of pixellated lutetium oxyorthosilicate (LYSO) crystals their energy resolution, and coincidence response function. Two SensL SPMarray-4 were used as light sensors. Two LYSO crystal blocks consisting of a arrays of 8×8 1.2 mm × 1.2 mm × 6.0 mm crystals on the lower layer and 7×7 1.2 mm × 1.2 mm × 4.0 mm crystals on the upper layer (which is offset by 1/2 the crystal width) were mounted on the SensL arrays. A second study was performed with single layer arrays of 8×8 1.2 mm × 1.2 mm × 10.0 mm crystals. All of the crystals in the dual layer block were easily identified with a peak to valley ratio of 7.2 while the single layer blocks had a peak to valley ratio of 11.2. The crystal dots were more uniformly spaced in the dual layer arrays suggesting that the inter-layer connection affords some useful light sharing. The average energy resolution for all 113 crystals was 16.3±2.3%. The coincidence response to a 0.25 mm Na-22 source in plastic was 0.97 ±0.12 mm for normally incident gamma rays with the detectors 120 mm apart. These results indicate that it should be possible to achieve a spatial resolution of about one millimetre near the center of the field of view. © 2012 IEEE.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NPARC number21270078
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Record identifier61a211a3-b5aa-4cd3-b9ad-130d4de9bc8b
Record created2013-12-19
Record modified2016-05-09
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