SiPM Side Detectors for Performance Enhancements of an EMCCD-based Gamma Camera

Abstract : To achieve ultra-high spatial resolution gamma ray imaging, the use of charge-coupled devices (CCOs) has become of great interest. However, these detectors still suffer from performances degradations due to their high intrinsic noise level. In our developped electron-multiplying CCO based gamma camera, we have introduced the use of solid state photomultipliers in side detection of a continuous crystal to improve the signal-to-background ratio and energy resolution. The so-called silicon photomultipliers (SiPMs) are individually read-out to measure the previously lost optical photons escaping through the crystal sides to give an a-priori evaluation of the energy and position of the gamma-rays interactions to a statistical algorithm for EM-CCD image analysis. In this work, we show the results obtained using 12 SiPMs optically coupled to a 3 mm thick CsI:Tl crystal where the prelocated events are reconstructed using a maximum likelihood algorithm. This algorithm uses Look-Up Tables (LUTs) evaluated by Monte-Carlo simulations to retrieve the interaction positions via the individual SiPMs signals. The spatial resolution obtained with this process is evaluated at 0.8 mm using a 200 mu m pinhole collimator with a Tc-99m source. The energy resolution is then measured at 19% for the 140 keY gamma-rays emission.
Type de document :
Communication dans un congrès
IEEE Nuclear Science Symposium/Medical Imaging Conference (NSS/MIC)/18th International Workshop on Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors, Oct 2011, Valencia, Spain. IEEE Nuclear Science Symposium Conference Record, pp.2829-2831, 2011, IEEE Nuclear Science Symposium Conference Record
Liste complète des métadonnées

http://hal.in2p3.fr/in2p3-01142954
Contributeur : Sandrine Guesnon <>
Soumis le : jeudi 16 avril 2015 - 13:53:01
Dernière modification le : jeudi 11 janvier 2018 - 06:13:36

Identifiants

  • HAL Id : in2p3-01142954, version 1

Citation

S. Salvador, M.A.N. Korevaar, J.W.T. Heemskerk, R. Kreuger, S. Huizenga J. Seifert, et al.. SiPM Side Detectors for Performance Enhancements of an EMCCD-based Gamma Camera. IEEE Nuclear Science Symposium/Medical Imaging Conference (NSS/MIC)/18th International Workshop on Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors, Oct 2011, Valencia, Spain. IEEE Nuclear Science Symposium Conference Record, pp.2829-2831, 2011, IEEE Nuclear Science Symposium Conference Record. 〈in2p3-01142954〉

Partager

Métriques

Consultations de la notice

80