TOF and DOI capable SiPM-PET detector using striplines that provide row and column based measurements

We propose and investigate a row-and column-based stripline readout method for a PET detector employing 1:1 scintillator-to-SiPM coupling and double-ended light readout for DOI. This new readout method has the potential to greatly reduce the electronic channels needed by a PET detector while support DOI and TOF measurements. For a proof of concept, we developed prototype readout boards and employ SensL's 6×6 SiPM arrays. The SiPMs are coupled 1:1 to LYSO crystals and the resulting LYSO/SiPM pixels have a pitch of 4.2 mm. We acquired the outputs of the SL boards by using either a digital oscilloscope at 5GHz or a multi-voltage threshold (MVT) digitizer [1]. The latter was considered because it is attractive for practical use. For both acquisition methods, we were able to clearly discriminate the rows and columns (and hence accurate crystal identification). The pixel-level energy resolutions at 511 keV were 11.4%-31.1% when using the oscilloscope and 21.5%22.9% when using the MVT digitizer. We have not measured the DOI and TOF resolutions in this work. However, based on our previous results with SL readout we expect to achieve 3-5 mm DOI resolution and 300-500ps TOF resolution.