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• W2109898511 abstract "<b>1398</b> <h3><b>Objectives</b></h3> To investigate the feasibility for developing a compact gamma camera by using CsI and SiPM arrays. <h3><b>Methods</b></h3> Crystal identification, energy resolution, and detector readout scheme were studied by optically coupling a 4x4 array of 2x2x5 mm CsI array to two tiled SiPM arrays through a 1.0 mm thick light guide. Each SiPM array has 16 pixels in 4x4 matrix format, with ~3x3 mm pixel size and ~0.2 mm inter-pixel gap. The insensitive gap between the two tiled SiPM arrays is ~1.0 mm. A resistor based charge division network was used to reduce the number of total readout electronics channels to 4. A Co-57 point source with ~1.0 mm diameter was used to irradiate the detector. Images were measured with or without a parallel-hole collimator (1.0 mm hole diameter). <h3><b>Results</b></h3> Even with increased noise from combined multiple SiPM pixels, all CsI scintillators were clearly identified with the resistor network readout. The average peak-to-valley ratio measured from the profile across the flood source image was 10:1, indicating that scintillators with smaller crystal size can also be well identified. The measured energy resolution from a typical scintillator was ~19% at 122 keV, which is relatively low compared to that measured from a standard camera at 140 keV. Besides additional increased noise from summed multiple SiPM pixels, this low energy resolution was mainly caused by the small size of discrete scintillators. The measured FWHM from the point spread function of Co-57 point source was ~4.6 mm, with 4 cm source-collimator distance. Our previous study has shown that 1x1x3 mm CsI array can also be identified, with reduced peak-to-valley ratio and energy resolution. <h3><b>Conclusions</b></h3> Latest SiPM array is well suited for reading out scintillator arrays consists of small crystal size from 1.0 to 2.0 mm and for developing a practical camera with large field of view. Optimization of detector design with different scintillator size is under investigation" @default.
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• W2109898511 date "2011-11-19" @default.
• W2109898511 modified "2023-09-27" @default.
• W2109898511 title "Problems with a great idea: referral by prehospital emergency services to a community-based falls-prevention service" @default.
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• W2109898511 doi "https://doi.org/10.1136/injuryprev-2011-040076" @default.
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