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Light spread manipulation in scintillators using laser induced optical barriers
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. Dept. of Radiolgy at Massachusetts General Hospital and Harvard Medical School, Boston, USA.ORCID iD: 0000-0001-7154-2411
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2018 (English)In: IEEE Transactions on Nuclear Science, ISSN 0018-9499, E-ISSN 1558-1578, Vol. 65, no 8, p. 2208-2215Article in journal (Refereed) Published
Abstract [en]

We are using the Laser Induced Optical Barriers (LIOB) technique to fabricate scintillator detectors with combined performance characteristics of the two standard detector types, mechanically pixelated arrays and monolithic crystals. This is done by incorporation of so-called optical barriers that have a refractive index lower than that of the crystal bulk. Such barriers can redirect the scintillation light and allow for control of the light spread in the detector. Previous work has shown that the LIOB technique has the potential to achieve detectors with high transversal and depth of interaction (DOI) resolution simultaneously in a single-side readout configuration, suitable for high resolution PET imaging. However, all designs studied thus far present edge effect issues similarly as in the standard detector categories. In this work we take advantage of the inherent flexibility of the LIOB technique and investigate alternative barrier patterns with the aim to address this problem. Light transport simulations of barrier patterns in LYSO:Ce, with deeper barrier walls moving towards the detector edge show great promise in reducing the edge effect, however there is a trade-off in terms of achievable DOI information. Furthermore, fabrication and characterization of a 20 mm thick LYSO:Ce detector with optical barriers forming a pattern of 1×1×20mm3 pixel like structures show that light channeling in laser-processed detectors in agreement with optical barriers with refractive index between 1.2 and 1.4 is achievable.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018. Vol. 65, no 8, p. 2208-2215
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Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-356263DOI: 10.1109/TNS.2018.2809570ISI: 000442365000039OAI: oai:DiVA.org:uu-356263DiVA, id: diva2:1234037
Funder
Swedish Research Council, 637-2014-6917NIH (National Institute of Health), 1R21EB020162-01A1Available from: 2018-07-20 Created: 2018-07-20 Last updated: 2018-11-05Bibliographically approved

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