Author/Authors :
Barone، نويسنده , , L.H. and Blazek، نويسنده , , K. and Bollini، نويسنده , , D. and Del Guerra، نويسنده , , A. and de Notaristefani، نويسنده , , F. and De Vincentis، نويسنده , , G. and Di Domenico، نويسنده , , Luca G. and Galli، نويسنده , , M. and Giganti، نويسنده , , M. and Maly، نويسنده , , P. and Pani، نويسنده , , R. De Pellegrini، نويسنده , , R. Della Pergola، نويسنده , , A. and Piffanelli، نويسنده , , A. and Scopinaro، نويسنده , , F، نويسنده ,
Abstract :
The HIRESPET Collaboration is developing a new concept of a gamma camera with sub-millimiter spatial resolution. The first prototype consists of a small field size gamma camera based on a Position Sensitive Photo-Multiplier Tube (PSPMT) coupled to a novel scintillation crystal. The intrinsic spatial resolution of the PSPMT is better than 0.3 mm. The scintillation crystal consists of yttrium aluminium perovskit (YAP:Ce). It has a light efficiency of about 40% relative to NaI, a good gamma radiation absorption (Z = 39) and a high density (5.37 g/cm3). It is inert and not hygroscopic. To match the PSPMT characteristics, a special crystal assembly has been made consisting of a bundle of YAP pillars, where a single crystal has the transversal dimension of 0.6 × 0.6 mm2 and a thickness ranging between 1 mm and 28 mm. Each scintillation pillar is optically separated from the other by a reflective layer of 5 μm thick. The preliminary results obtained from the gamma camera prototype (YAP camera) show spatial resolution values ranging between 0.6 mm and 1 mm and an intrinsic detection efficiency comparable with a standard Anger camera.
