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First results with MACACO II: second prototype of a Compton telescope

AuthorsRos García, Ana ; Barrientos, L.; Barrio Toala, J.; Bernabéu, José ; Borja-LLoret, P.; Dendooven, P.; Etxebeste, Ane; Gabarda, L.; García López, J. ; Jiménez-Ramos, M. C. ; Lacasta Llácer, Carlos ; Marco Hernández, Ricardo ; Muñoz, Enrique; Oliver Guillén, José Francisco ; Ozoemelan, I.; Praena, Javier ; Roser, J.; Senra, C.; Solaz, Carles; Llosá, Gabriela
Issue Date10-Nov-2018
CitationIEEE Nuclear Science Symposium and Medical Imaging Conference (2018)
AbstractThe IRIS group at IFIC Valencia is developing a three-layer Compton camera for treatment monitoring in ion beam therapy. The system is composed of three detector planes, each made of a LaBr3 monolithic crystal coupled to SiPM arrays. The first prototype (MACACO) was fully characterised in the laboratory and in beam tests demonstrating the feasibility of the proposed technology. A second prototype (MACACO II), described in this work, is currently being developed to improve performance. The SiPM arrays have been replaced by newer models, leading to an improved detector energy resolution which translates into a higher spatial resolution of the telescope. A new coincidence board allows acquisition of data with any two or all three detectors simultaneously. In addition, the image reconstruction code has been improved with an accurate model of the sensitivity matrix. The device has also been tested in two accelerator facilities. The first involved a proton beam of 18 MeV impinging a graphite target. The results allowed the successful reconstruction of two target positions separated by 5 mm. The second test beam used protons of 150 MeV impinging on a PMMA target. Preliminary analysis results show prompt-gamma energy spectra as expected for these proton energies. Analysis of this data is ongoing, with the aim of reconstructing the Bragg peak profilein the PMMA target. Further improvements to the readout electronics are also underway.
DescriptionTrabajo presentado en el IEEE Nuclear Science Symposium and Medical Imaging Conference, celebrado en Sydney (Australia), del 10 al 17 de noviembre de 2018
Appears in Collections:(IFIC) Comunicaciones congresos
(CNA) Comunicaciones congresos
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