A SiPM-Readout ASIC for SPECT Applications
| Autor: | M. Occhipinti, Paolo Busca, Carlo Fiorini, Paolo Trigilio, R. Quaglia |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
business.industry Detector Scintillator Chip silicon photomultiplier (SiPM) SiPM front-end single photon emission computed tomography (SPECT) Multiplexer Atomic and Molecular Physics and Optics law.invention Silicon photomultiplier Application-specific integrated circuit law Optoelectronics SiPM readout Radiology Nuclear Medicine and imaging business Application specific integrated circuit (ASIC) SPECT/MRI Instrumentation Energy (signal processing) Gamma camera |
| Popis: | In this paper, we present ANGUS, an application specific integrated circuit (ASIC) for silicon photomultiplier (SiPM) readout designed for low-energy gamma imaging (140 keV), specifically targeting clinical single photon emission computed tomography (SPECT) applications based on Anger-type detectors. The chip is composed of 36 channels, each featuring a current conveyor input followed by an RC filter with a time constant programmable from 200 ns up to 10 $\mu \text{s}$ , a baseline holder and a peak stretcher stage. Multichannel readout is performed with a polling strategy thanks to two analog multiplexers. The chip has been designed to cope with input capacitance values of several nanofarad, like the ones featured by the large-sized SiPM pixels (8 mm ${\times }$ 8 mm) of the application. Despite being conceived for operation with slow scintillator crystals like cesium-iodide (CsI), this ASIC can successfully manage the readout of faster crystals like lutetium-yttrium oxyorthosilicate. Measurements of the ASIC carried out on a fully equipped SPECT detection module have shown an energy resolution of 13.7% at the 140-keV line of 99mTc, for a 5 cm ${\times }$ 5 cm gamma camera consisting of a continuous CsI crystal and a SiPM detection plane cooled at 0 °C. |
| Databáze: | OpenAIRE |
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