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Scintillator-based Photon Counting Detector: is it feasible?
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. Massachusetts Gen Hosp, Gordon Ctr Med Imaging, Boston, MA 02114 USA;Harvard Med Sch, Boston, MA 02115 USA.ORCID iD: 0000-0001-7154-2411
Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA.
Univ Sherbrooke, Inst Interdisciplinaire Innovat Technol 3IT, GRAMS Lab, Sherbrooke, PQ, Canada.
Massachusetts Gen Hosp, Gordon Ctr Med Imaging, Boston, MA 02114 USA;Harvard Med Sch, Boston, MA 02115 USA;Near East Univ, Dept Biomed Engn, Nicosia, Cyprus.
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2016 (English)In: 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference And Room-Temperature Semiconductor Detector Workshop (Nss/Mic/Rtsd), 2016Conference paper, Published paper (Refereed)
Abstract [en]

By utilizing finely pitched scintillator arrays where the scintillator has high atomic number and density, fast decay time, and high light output, realizing a scintillator-based Photon Counting Detector (PCD) is conceptually feasible. Fabrication of fine-pitched scintillator arrays however, has been the bottleneck for realizing such detectors. Combining the novel scintillator fabrication technique called laser-induced optical barriers (LIOB) where optical barriers can be placed inside a transparent crystal and act as a reflector without removing the material, with laser ablation, we are now able to overcome the obstacles for developing scintillator-based PCD. In this regard, we are developing an LYSO-based PCD where the LYSO crystal is laser pixelated to sub-mm pixels. The scintillator array will be coupled to an application specific integrated circuit (ASIC) where each ASIC pixel has built-in photodiode, amplifiers and 3-4 energy windows and their associated counters. We have simulated light transport for different scenarios where the crystal is pixelated by a combination of LIOB and laser cut techniques, where the 2 mm thick crystal is first pixelated by LIOB to a depth and then the rest is pixelated by the ablation technique. We also simulated the fraction of collected light in the same scintillator pixel by modeling various surface properties of the pixel cuts as well as optical barrier surface roughness and refractive index (RI). Simulation results show that up to similar to 70% of the scintillation light will be contained in the same pixel when only using the LIOB technique with barrier refractive index of 1.0. These results suggest that laser processed arrays can potentially change the paradigm in PCD development as they can replace the traditional array production and thus allow for scintillator-based PCD development in a more robust and cost-effective manner.

Place, publisher, year, edition, pages
2016.
Series
IEEE Nuclear Science Symposium and Medical Imaging Conference, ISSN 1095-7863
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:uu:diva-400852DOI: 10.1109/NSSMIC.2016.8069382ISI: 000432419500004ISBN: 978-1-5090-1642-6 (electronic)ISBN: 978-1-5090-1643-3 (print)OAI: oai:DiVA.org:uu-400852DiVA, id: diva2:1382944
Conference
IEEE Nuclear Science Symposium / Medical Imaging Conference / Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD), OCT 29-NOV 06, 2016, Strasbourg, FRANCE
Funder
Swedish Research CouncilAvailable from: 2020-01-07 Created: 2020-01-07 Last updated: 2020-01-07Bibliographically approved

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Bläckberg, Lisa

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