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Simulation study of light transport in laser-processed LYSO:Ce detectors with single-side readout
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Massachusetts General Hospital & Harvard Medical School.
Massachusetts General Hospital & Harvard Medical School.
Massachusetts General Hospital & Harvard Medical School.
2017 (English)In: Physics in Medicine and Biology, ISSN 0031-9155, E-ISSN 1361-6560, Vol. 62, no 21, 8419-8440 p.Article in journal (Refereed) Published
Abstract [en]

A tightly focused pulsed laser beam can locally modify the crystal structure inside the bulk of a scintillator. The result is incorporation of so-called optical barriers with a refractive index different from that of the crystal bulk, that can be used to redirect the scintillation light and control the light spread in the detector. We here systematically study the scintillation light transport in detectors fabricated using the laser induced optical barrier technique, and objectively compare their potential performance characteristics with those of the two mainstream detector types: monolithic and mechanically pixelated arrays. Among countless optical barrier patterns, we explore barriers arranged in a pixel-like pattern extending all-the-way or half-way through a 20 mm thick LYSO:Ce crystal. We analyze the performance of the detectors coupled to MPPC arrays, in terms of light response functions, flood maps, line profiles, and light collection efficiency. Our results show that laser-processed detectors with both barrier patterns constitute a new detector category with a behavior between that of the two standard detector types. Results show that when the barrier-crystal interface is smooth, no DOI information can be obtained regardless of barrier refractive index (RI). However, with a rough barrier-crystal interface we can extract multiple levels of DOI. Lower barrier RI results in larger light confinement, leading to better transverse resolution. Furthermore we see that the laser-processed crystals have the potential to increase the light collection efficiency, which could lead to improved energy resolution and potentially better timing resolution due to higher signals. For a laser-processed detector with smooth barrier-crystal interfaces the light collection efficiency is simulated to  >42%, and for rough interfaces  >73%. The corresponding numbers for a monolithic crystal is 39% with polished surfaces, and 71% with rough surfaces, and for a mechanically pixelated array 35% with polished pixel surfaces and 59% with rough surfaces.

Place, publisher, year, edition, pages
2017. Vol. 62, no 21, 8419-8440 p.
National Category
Other Medical Engineering Other Physics Topics
Identifiers
URN: urn:nbn:se:uu:diva-333678DOI: 10.1088/1361-6560/aa8deaOAI: oai:DiVA.org:uu-333678DiVA: diva2:1157411
Funder
Swedish Research Council, 637-2014-6917NIH (National Institute of Health), 1R21EB020162-01A1
Available from: 2017-11-15 Created: 2017-11-15 Last updated: 2017-11-17Bibliographically approved

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The full text will be freely available from 2018-10-19 23:35
Available from 2018-10-19 23:35

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Bläckberg, Lisa

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