NuVISION: a Portable Multimode Gamma Camera based on HiSPECT Imaging Module

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Abstract
We have recently developed NuVISION, a portable gamma camera based on CZT. It is based on the HiSPECT imaging module architecture featuring IDeFX-HD ASICs [1] and 3D subpixel positioning architecture [2]. This device weights 3 kilograms, is waterproof (IP65) and is fully autonomous: it embeds an hybrid ARM processor/FPGA system on a chip and is powered by a battery allowing 7-hour operation. It can be interfaced to a computer or tablet by wired or wireless local area network.The detector is 40×40×6 mm thick CZT with 2.5 mm anode pitch allowing a overall resolution of 2.5 % at 122 keV and 1.5 % at 662 keV. The system uses coded aperture mask imaging to provide high sensitivity and high resolution in a limited frontal field of view (45°). Compton imaging is used to coarsely localize out of field radiation at the same time. It has been tested on various isotopes from Am-241 to Co-60 and it performs spectrometric imaging with automated isotope recognition. System sensitivity is sufficient to localize a 50 nSv/h Co-57 source in natural background in less than 1 second and a 50 nSv/h Cs-137 source in less than 1 minute. Additionally, processing speed allows to perform real time imaging and to observe mobile sources. We describe CZT detector spectral and imaging performance, the FPGA based 3D positioning and the list-mode image reconstruction technique used.

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