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Novel laser-processed CsI:Tl detector for SPECT
Harvard Med Sch, Massachusetts Gen Hosp, Boston, MA 02129 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Harvard Med Sch, Massachusetts Gen Hosp, Boston, MA 02129 USA..
Harvard Med Sch, Massachusetts Gen Hosp, Boston, MA 02129 USA..
Harvard Med Sch, Massachusetts Gen Hosp, Boston, MA 02129 USA..
2016 (English)In: Medical physics (Lancaster), ISSN 0094-2405, Vol. 43, no 5, 2630Article in journal (Refereed) PublishedText
Abstract [en]

Purpose: The aim of this work is to demonstrate the feasibility of a novel technique for fabrication of high spatial resolution CsI:Tl scintillation detectors for single photon emission computed tomography systems. Methods: The scintillators are fabricated using laser-induced optical barriers technique to create optical microstructures (or optical barriers) inside the CsI: Tl crystal bulk. The laser-processed CsI: Tl crystals are 3, 5, and 10 mm in thickness. In this work, the authors focus on the simplest pattern of optical barriers in that the barriers are created in the crystal bulk to form pixel-like patterns resembling mechanically pixelated scintillators. The monolithic CsI: Tl scintillator samples are fabricated with optical barrier patterns with 1.0x1.0 mm(2) and 0.625x0.625 mm(2) pixels. Experiments were conducted to characterize the fabricated arrays in terms of pixel separation and energy resolution. A 4x4 array of multipixel photon counter was used to collect the scintillation light in all the experiments. Results: The process yield for fabricating the CsI: Tl arrays is 100% with processing time under 50 min. From the flood maps of the fabricated detectors exposed to 122 keV gammas, peak-to-valley (P/V) ratios of greater than 2.3 are calculated. The P/V values suggest that regardless of the crystal thickness, the pixels can be resolved. Conclusions: The results suggest that optical barriers can be considered as a robust alternative to mechanically pixelated arrays and can provide high spatial resolution while maintaining the sensitivity in a high-throughput and cost-effective manner.

Place, publisher, year, edition, pages
2016. Vol. 43, no 5, 2630
Keyword [en]
single photon emission computed tomography, laser induced optical barriers, high spatial resolution, CsI:Tl scintillator
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:uu:diva-300093DOI: 10.1118/1.4947294ISI: 000378924200061PubMedID: 27147372OAI: oai:DiVA.org:uu-300093DiVA: diva2:950824
Funder
NIH (National Institute of Health), 1R21EB020162-01A1 1R03EB020762-01Swedish Research Council
Available from: 2016-08-02 Created: 2016-08-02 Last updated: 2016-08-02Bibliographically approved

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