Evaluation of high density 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/TNS.2012.2201958
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TypeArticle
Journal titleIEEE Transactions on Nuclear Science
ISSN0018-9499
Volume59
Issue5
Article number6298061
Pages17911797; # of pages: 7
SubjectBottom layers; Crystal block; Crystal density; Crystal response; Dual layer; Field of views; High density; High packing density; Low bias voltage; Lutetium oxyorthosilicate; PET scanner; Pixellated crystals; Pre-clinical; Response functions; Silicon photomultiplier; Small animal PET; Small animal PET scanners; Translation stage; Detectors; Photomultipliers; Polyethylene terephthalates; Positron emission tomography; Separation; Sodium; Silicon detectors
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. We tested two dual-layer blocks of pixellated lutetium oxy-orthosilicate (LYSO) coupled to SensL 4× 4 SiPM arrays in terms of their ability to resolve all elements using resolvability index (RI) defined by the FWHM of the crystal response function divided by the separation. Our crystal blocks had 49 1.67×1.67×6.0 mm 3 crystals on the bottom layer and 36 1.67× 1.67× 4.0 mm 3 crystals in the top layer (offset by 1/2 of the crystal pitch). All 85 crystals were well resolved: RI= 0.46 compared with RI = 0.41 for a conventional pre-clinical PET scanner's block with 40% lower crystal density. A pair of crystal blocks mounted on translation stages scanned a 0.25 mm 22Na source in 60 0.25 mm steps with the detectors angulated as if there were 16 blocks in a ring. The FWHM of the coincidence response function near the centre of the field of view was 1.31 mm and FWTM was 2.7 mm with the detectors separated by 200 mm. © 2012 IEEE.
Publication date
LanguageEnglish
AffiliationMedical Devices; National Research Council Canada
Peer reviewedYes
NPARC number21270084
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Record identifier9a738092-643f-4b56-b16a-41106a164653
Record created2013-12-19
Record modified2016-05-09
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