We have proposed a new scanner for small-animal positron emission tomography (PET) based on stacks of double sided silicon detectors. Each stack is composed of 40 planar detectors with dimension 60 times 60 times 1 mm3 and 128 orthogonal strips on both sides to read the two coordinates of interaction, the third being the detector number in the stack. Multiple interactions in a stack may be discarded. In this way we achieve a precise determination of the interaction point of the two 511 keV photons. The reduced dimensions of the scanner also improve the solid angle coverage resulting in a high sensitivity. Preliminary results were obtained with MEGA prototype tracker. In this work we present the results obtained with double sided silicon detectors, manufactured by ITC-Fondazione Bruno Kessler (Trento- Italy), having an active area of 3 times 3 cm2, a strip pitch of 500 mum, strip width of 300 mum and thickness of 1 mm, equipped with 64 orthogonal p and n strips on opposite sides. We are using two different kinds of analog front end electronic chains: a single channel prototype of an ASIC circuit designed by Politecnico di Milano for fast timing measurements and VATAGP2.5 ASIC by IDEAS to evaluate the spatial resolution.
First measurements for the SiliPET project: A small animal PET scanner based on stacks of silicon detectors
AURICCHIO, Natalia;DI DOMENICO, Giovanni;ZAVATTINI, Guido;
2007
Abstract
We have proposed a new scanner for small-animal positron emission tomography (PET) based on stacks of double sided silicon detectors. Each stack is composed of 40 planar detectors with dimension 60 times 60 times 1 mm3 and 128 orthogonal strips on both sides to read the two coordinates of interaction, the third being the detector number in the stack. Multiple interactions in a stack may be discarded. In this way we achieve a precise determination of the interaction point of the two 511 keV photons. The reduced dimensions of the scanner also improve the solid angle coverage resulting in a high sensitivity. Preliminary results were obtained with MEGA prototype tracker. In this work we present the results obtained with double sided silicon detectors, manufactured by ITC-Fondazione Bruno Kessler (Trento- Italy), having an active area of 3 times 3 cm2, a strip pitch of 500 mum, strip width of 300 mum and thickness of 1 mm, equipped with 64 orthogonal p and n strips on opposite sides. We are using two different kinds of analog front end electronic chains: a single channel prototype of an ASIC circuit designed by Politecnico di Milano for fast timing measurements and VATAGP2.5 ASIC by IDEAS to evaluate the spatial resolution.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
