Speaker
João Veloso
(I3N, Physics Department, University of Aveiro)
Description
A concept of a Compton Camera (CC) based on a High Pressure Electroluminescence Chamber coupled to a position sensitive Gaseous PhotoMultiplier (GPM) for Nuclear Medical Imaging (NMI), is proposed.
A Compton Camera presents a different solution of the Gamma Camera (GC) as it provides position and energy information about the incoming photon via electronic “collimator”, instead of the use of a mechanical collimator responsible for the huge reduction of the sensitivity of the GC.
In the proposed concept the high pressure chamber filled with a mixture of noble gases up to 20 bar, has a drift/conversion region which acts as the active detection medium and a scintillation region where the drift electrons produce VUV photons that are detected by the 2D-position sensitive GPM, using a reflective CsI photocathode on top of a cascade of THGEMs. The third dimension of the interaction position is determined by the electrons drift time. The information of the 3D interaction position and deposited energy, will allows to determine the cone of emission and so, image reconstruction.
In this work we present the developments of the proposed Compton Camera with an 12 cm diameter active area. Comparison with other systems will be presented together with simulations of the detector response and initial experimental results, as well as the GPM imaging capability to detect VUV light.
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Author
João Veloso
(I3N, Physics Department, University of Aveiro)
Co-authors
Ana Silva
(I3N, Physics Department, University of Aveiro)
Carlos Azevedo
(I3N, Physics Department University of Aveiro)
Fábio Pereira
(I3N, Physics Department, University of Aveiro)
Lara Carramate
(I3N, Physics Department, University of Aveiro)
Pedro Correia
(I3N, Physics Department, University of Aveiro)
Tiago Lopes
(I3N, Physics Department, University of Aveiro)
