In this paper we propose 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 60×60×1 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 are 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 (11 double sided Si detector layers, each with a thickness of 0.5mm and a strip pitch of 470 microns), divided into two stacks 2cm apart made of respectively 5 and 6 prototype layers, placing a small spherical 22Na source in different positions. We report on the results, spatial resolution, spectral and timing performances obtained with double sided silicon detectors, manufactured by ITC-FBK, having an active area of 3x3cm2 and a strip pitch of 500μm. Two different strip widths of 300μm and 200μm, and two thicknesses of 1mm and 1.5mm, equipped with 64 orthogonal p and n strips on opposite sides were read out with the VATAGP2.5 ASIC, a 128-channel “general purpose” charge sensitive amplifier. Each channel is composed of a low-noise/low-power preamplifier, a shaper (peaking time of 3.1μs) with sample/hold, multiplexed analogue readout and a fast shaper (peaking time of 1.1μs) that gives a trigger signal.

Experimental Measurements for the SiliPET project: A Small Animal PET Scanner based on Stacks of Silicon Detectors

Zorzi, Nicola;Boscardin, Maurizio;
2008

Abstract

In this paper we propose 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 60×60×1 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 are 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 (11 double sided Si detector layers, each with a thickness of 0.5mm and a strip pitch of 470 microns), divided into two stacks 2cm apart made of respectively 5 and 6 prototype layers, placing a small spherical 22Na source in different positions. We report on the results, spatial resolution, spectral and timing performances obtained with double sided silicon detectors, manufactured by ITC-FBK, having an active area of 3x3cm2 and a strip pitch of 500μm. Two different strip widths of 300μm and 200μm, and two thicknesses of 1mm and 1.5mm, equipped with 64 orthogonal p and n strips on opposite sides were read out with the VATAGP2.5 ASIC, a 128-channel “general purpose” charge sensitive amplifier. Each channel is composed of a low-noise/low-power preamplifier, a shaper (peaking time of 3.1μs) with sample/hold, multiplexed analogue readout and a fast shaper (peaking time of 1.1μs) that gives a trigger signal.
9781424427147
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11582/4433
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