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Aim: Investigate whether a time walk assessment derived from crystal lightsharing and multi-photon time stamps can improved the TOF resolution.  Method: Monte Carlo simulations were performed for SiPM (FBK-NUV-HD) coupledto conventional 4x4 mm2 pixelated LSO (0.2%Ca:Ce ) and also coupled to 8x4 mm2pixelated LSO in which a triangular optical window allows light sharing betweenthe two 4x4 mm2 sub-pixels depending on the DOI. A time walk estimation wasmodelled as a DOI dependent weighted sum of the time differences within thephotons detection sequence. The DOI dependent weights were optimized in orderto get the best TOF resolution.  Results: A strong linear DOI dependence of the light sharing between the two4x4 mm2 sub-pixels was observed. The TOF resolutions for a 4x4x20 mm3 LSO were99.7, 81.2, 66.4 ps-fwhm without any correction, with DOI correction and withDOI dependent time walk correction, respectively. The time walk correction wasderived from the 7 time stamps of the (2**k )th photons in the sequence, with kwithin[0,6].  Conclusion: photon time walk can be estimated from the photon time detectionseries and can be advantageously combined with the DOI assessment to improveTOF resolution.

Near 65ps-fwhm in 20mm-LSO TOF-PET by using a time walk correction based on multi-photon stamps: a Monte Carlo study