Abstract:
:The coincidence time resolution (CTR) becomes a key parameter of 511 keV gamma detection in time of flight positron emission tomography (TOF-PET). This is because additional information obtained through timing leads to a better noise suppression and therefore a better signal to noise ratio in the reconstructed image. In this paper we present the results of CTR measurements on two different SiPM technologies from FBK coupled to LSO:Ce codoped 0.4%Ca crystals. We compare the measurements performed at two separate test setups, i.e. at CERN and at FBK, showing that the obtained results agree within a few percent. We achieve a best CTR value of 85 ± 4 ps FWHM for 2 × 2 × 3 mm(3) LSO:Ce codoped 0.4%Ca crystals, thus breaking the 100 ps barrier with scintillators similar to LSO:Ce or LYSO:Ce. We also demonstrate that a CTR of 140 ± 5 ps can be achieved for longer 2 × 2 × 20 mm(3) crystals, which can readily be implemented in the current generation PET systems to achieve the desired increase in the signal to noise ratio.
journal_name
Phys Med Bioljournal_title
Physics in medicine and biologyauthors
Nemallapudi MV,Gundacker S,Lecoq P,Auffray E,Ferri A,Gola A,Piemonte Cdoi
10.1088/0031-9155/60/12/4635subject
Has Abstractpub_date
2015-06-21 00:00:00pages
4635-49issue
12eissn
0031-9155issn
1361-6560journal_volume
60pub_type
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