Author/Authors :
Vilardi، نويسنده , , I. and Braem، نويسنده , , A. and Chesi، نويسنده , , E. and Ciocia، نويسنده , , Robert F. and Colonna، نويسنده , , N. and Corsi، نويسنده , , F. and Cusanno، نويسنده , , F. and De Leo، نويسنده , , R. and Dragone، نويسنده , , A. and Garibaldi، نويسنده , , F. and Joram، نويسنده , , C. and Lagamba، نويسنده , , L. and Marrone، نويسنده , , S. and Nappi، نويسنده , , E. and Séguinot، نويسنده , , J. and Tagliente، نويسنده , , G. and Valentini، نويسنده , , A. and Weilhammer، نويسنده , , P. and Zaidi، نويسنده , , H.، نويسنده ,
Abstract :
The effective light attenuation length in thin bars of polished YAP:Ce and LYSO:Ce scintillators with lengths of the order of 10 cm has been studied for various wrappings and coatings of the crystal lateral surfaces. This physical parameter plays a key role in a novel 3D PET concept based on axial arrays of long scintillator bars read out at both ends by Hybrid Photodetectors (HPDs) since it influences the spatial, energy and time resolutions of such a device. In this paper we show that the effective light attenuation length of polished crystals can be reduced by wrapping their lateral surfaces with Teflon, or tuned to the desired value by depositing a coating of Cr or Au of well-defined thickness. The studies have been carried out with YAP and LYSO long scintillator bars, read out by standard photomultiplier tubes. Even if the novel PET device will use different scintillators and HPD readout, the results described here prove the feasibility of an important aspect of the concept and provide hints on the potential capabilities of the device.
Keywords :
YAP:CE , LYSO:Ce , HPD , PET
