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2 2025

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Preface : 2nd International workshop on machine learning and quantum computing applications in medicine and physics

Krzemień Wojciech, Klimaszewski Konrad, Raczyński Lech

Computer Science

2025

T. 26 (SI)

5--8

This is a preface for the special issue including extended versions of the selected papers submitted to 2ND INTERNATIONAL WORKSHOP ON MACHINE LEARNING AND QUANTUM COMPUTING APPLICATIONSIN MEDICINE AND PHYSICS

Improving PET scanner time-of-flight resolution using additional prompt photon

Raczyński Lech, Krzemień Wojciech, Klimaszewski Konrad

Computer Science

2025

T. 26 (SI)

127--145

Positronium Imaging requires two classes of events: double-coincidences originated from pair of back-to-back annihilation photons and triple-coinciden cescomprised with two annihilation photons and one additional prompt photon.The standard reconstruction of the emission position along the line-of-response of a triple-coincidence event is the same as in the case of double-coincidence event; an information introduced by the high-energetic prompt photon is ignored. In this study, we propose to extend the reconstruction of the position of the triple-coincidence event by taking into account the time and position of the prompt photon. We incorporate knowledge about the positronium life time distribution and discuss the limitations of the method based on the simulation data. We highlight that the uncertainty of the estimate provided by prompt photon alone is much higher than the standard deviation estimated based on two annihilation photons. We finally demonstrate the extent of resolution improvement that can be obtained when estimated using three photons.