In the present work we briefly describe the architecture of a photo-detection module, designed in the framework of the INSERT (INtegrated SPECT/MRI for Enhanced Stratification in Radio-chemoTherapy) project, supported by the European Community. We focus on two main elements of the module: the SiPM photo-detector unit and the multi-channel ASIC. These two components have been investigated with dedicated and independent setups to assess preliminary performance of INSERT architecture. In details, we designed a 25.30mmx25.85mm tile, comprising 9 pixels, each one with an 8mmx8mm active area. We developed an Anger camera to characterize the tile coupled to a CsI:Tl scintillator (6mm thick). We measured an average spatial resolution (FWHM) of 2mm in the central region of the Field of View and a 15.3% energy resolution using a 57-Co source (122 keV), when the tile is cooled down to 0C to reduce the impact of the dark count rate. Furthermore, we developed ANGUS, a 36-channels 0.35um CMOS technology ASIC designed to cope with input capacitance up to 5 nF, typical of large area SiPM pixels. The spectroscopic capability of single readout channels were evaluated by coupling an 8mmx8mm pixel with a cylindrical CsI:Tl scintillator (8mm diameter, 10mm thickness). Energy resolution at room temperature provided values between 13% and 13.5% (FWHM) at the 122 keV line for the nine pixels.

Experimental Evaluation of a SiPM-Based Scintillation Detector for MR-Compatible SPECT Systems

Piemonte, Claudio;Ferri, Alessandro;Gola, Alberto Giacomo;
2015

Abstract

In the present work we briefly describe the architecture of a photo-detection module, designed in the framework of the INSERT (INtegrated SPECT/MRI for Enhanced Stratification in Radio-chemoTherapy) project, supported by the European Community. We focus on two main elements of the module: the SiPM photo-detector unit and the multi-channel ASIC. These two components have been investigated with dedicated and independent setups to assess preliminary performance of INSERT architecture. In details, we designed a 25.30mmx25.85mm tile, comprising 9 pixels, each one with an 8mmx8mm active area. We developed an Anger camera to characterize the tile coupled to a CsI:Tl scintillator (6mm thick). We measured an average spatial resolution (FWHM) of 2mm in the central region of the Field of View and a 15.3% energy resolution using a 57-Co source (122 keV), when the tile is cooled down to 0C to reduce the impact of the dark count rate. Furthermore, we developed ANGUS, a 36-channels 0.35um CMOS technology ASIC designed to cope with input capacitance up to 5 nF, typical of large area SiPM pixels. The spectroscopic capability of single readout channels were evaluated by coupling an 8mmx8mm pixel with a cylindrical CsI:Tl scintillator (8mm diameter, 10mm thickness). Energy resolution at room temperature provided values between 13% and 13.5% (FWHM) at the 122 keV line for the nine pixels.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11582/301682
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