The ClearPET project

Auffray, E.; Bruyndonckx, Peter; Devroede, O.; Fedorov, A.; Heinrichs, U.; Korjik, M.; Krieguer, M.; Kuntner, Claudia; Lartizien, Carole; Lecoq, P.; Léonard, Sarah; Morel, C.; Mosset, J.-B.; Pédrini, C.; Petrosian, A. G.; Pietrzyk, U.; Rey, M.; Saladino, S.; Sappey-Marinier, Dominique; Simon, L.; Streun, M.; Tavernier, S.; Vieira, J.-M.; Ziemons, K.

doi:10.1016/j.nima.2004.03.115

Cited by 32 publications

(8 citation statements)

References 4 publications

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“…Accordingly, total reflection is observed for incidence angles that are larger than the angle of total reflection of the scintillator-grease interface, (4) For a plain coupling face and , is of the order of 50 and 55 for LuYAP and LYSO, respectively.…”

Section: Discussion Of Resultsmentioning

confidence: 98%

“…The present work evaluates the impact of various structural parameters of a PhC on light extraction and presents a simple approach which allows for estimating the effect of the PhC on for a given scintillator. The main focus of the study is on the two heavy inorganic scintillators LuYAP and LYSO that have been used in the dedicated PET systems 0018-9499/$26.00 © 2010 IEEE ClearPET and ClearPEM developed by the Crystal Clear Collaboration [4], [5]; however, the results presented herein are also valid for many other scintillators with comparable optical properties.…”

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confidence: 99%

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Improving light extraction from heavy inorganic scintillators by photonic crystals

Kronberger

Auffray

Lecoq

2008

2008 IEEE Nuclear Science Symposium Conference Record

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Abstract-The impact of photonic crystal (PhC) slabs on the extraction of light from the heavy inorganic scintillators LuYAP and LYSO is evaluated by combining numerical transmission calculations of a scintillator with PhC coupling face with simulations of the light propagation inside the scintillator. The transmission of the scintillator-PhC coupling face is determined by means of a scattering-matrix algorithm. The PhC slab is assumed to consist of a bulk material with a triangular pattern of air holes that is sandwiched between the scintillator substrate and a layer of optical grease. By folding these data with the angular distribution of the scintillation photons arriving at the coupling face, the light collection efficiency of the system is estimated. The results indicate that a scintillator coupling face equipped with a PhC slab can exhibit a significant gain in . This gain is due to the extraction of photons that are lost in a scintillator with plain exit surface due to total internal reflection. The largest simulated gains of up to a factor of two are observed for small scintillators and for PhC coupling faces with bulk sub , avg sub grease , and , where bulk , sub and grease are the respective refractive indexes of the PhC bulk, the scintillator substrate, and the optical grease, the lattice constant of the PhC pattern, the thickness of the PhC slab, and avg the average refractive index of the PhC slab determined by bulk and the filling factor . Due to the approximations and idealizations of the model, these gains in light collection efficiency may be lower in practical applications and are expected to be achieved only with specular reflectors with reflectivities above 90%, and PhC bulk materials with absorption coefficients abs 10 3 10 4 cm 1 over the whole wavelength range of emission of the scintillator.

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Section: Discussion Of Resultsmentioning

confidence: 98%

mentioning

confidence: 99%

Improving light extraction from heavy inorganic scintillators by photonic crystals

Kronberger

Auffray

Lecoq

2008

2008 IEEE Nuclear Science Symposium Conference Record

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“…The scintillation element with cross-section 2 Â 2 mm is individually read out with PSPMT pixel that gives spatial resolution of about 1.5 mm FWHM in CFOV (with 18 F). In addition depth of interaction (DOI) determination capability is provided by double layer LSO/LuYAP phoswich detector with pulse shape layer discrimination to improve spatial resolution on the periphery of the field of view [2,3], Fig. 1.…”

Section: Modern Trends In the Pet Detector Developmentmentioning

confidence: 99%

Development of scintillation materials for PET scanners

Korzhik¹,

Fedorov²,

Annenkov³

et al. 2007

Nuclear Instruments and Methods in Physics Research Section A:

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“…We describe the development and the performance measurements of an optimized LSO/LuYAP phoswich detector head for the ClearPET demonstrator, which is built in Lausanne among five prototypes developed within the Crystal Clear Collaboration (CCC). The five prototypes are all using the same technology, but with different crystal sizes and phoswich encapsulations [1], [2]. With small diameter tomographs, the uncertainty on the depth-of-interaction (DOI) of the impinging photon in the scintillating crystal results in parallax errors that degrade image resolution when getting away from the axis of the tomograph.…”

Section: Introductionmentioning

confidence: 99%

Development of an optimized LSO/LuYAP phoswich detector head for the Lausanne ClearPET demonstrator

Mosset

Devroede²,

Krieguer³

et al. 2006

IEEE Trans. Nucl. Sci.

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This paper describes the LSO/LuYAP phoswich detector head developed for the ClearPET small animal PET scanner demonstrator that is under construction in Lausanne within the Crystal Clear Collaboration. The detector head consists of a dual layer of 8/spl times/8 LSO and LuYAP crystal arrays coupled to a multi-anode photomultiplier tube (Hamamatsu R7600-M64). Equalistion of the LSO/LuYAP light collection is obtained through partial attenuation of the LSO scintillation light using a thin aluminum deposit of 20-35 nm on LSO and appropriate temperature regulation of the phoswich head between 30/spl deg/C to 60/spl deg/C. At 511keV, typical FWHM energy resolutions of the pixels of a phoswich head amounts to (28/spl plusmn/2)% for LSO and (25/spl plusmn/2)% for LuYAP. The LSO versus LuYAP crystal identification efficiency is better than 98%. Six detector modules have been mounted on a rotating gantry. Axial and tangential spatial resolutions were measured up to 4 cm from the scanner axis and compared to Monte Carlo simulations using GATE. FWHM spatial resolution ranges from 1.3 mm on axis to 2.6 mm at 4 cm from the axis

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The ClearPET project

Cited by 32 publications

References 4 publications

Improving light extraction from heavy inorganic scintillators by photonic crystals

Improving light extraction from heavy inorganic scintillators by photonic crystals

Development of scintillation materials for PET scanners

Development of an optimized LSO/LuYAP phoswich detector head for the Lausanne ClearPET demonstrator

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