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Beam tests and upgrades of MACACO II Compton telescope

AuthorsBarrientos, L.; Barrio Toala, J.; Borja-LLoret, P.; Esteban, A.; Lacasta Llácer, Carlos ; Marco Hernández, Ricardo ; Muñoz, Enrique; Oliver Guillén, José Francisco ; Ros García, Ana ; Roser, J.; Solaz, Carles; Viegas, R.; Llosá, Gabriela
Issue Date15-Jul-2019
CitationXXXVII Reunión Bienal de la Real Sociedad Española de Física (2019)
AbstractThe use of hadron therapy in cancer treatment is increasing in the world given its precise energy deposition to the tumour and the dose reduction to healthy tissue as compared to conventional photon radiotherapy. Realtime treatment monitoring is one of the main challenges addressed nowadays. The IRIS group at IFIC-Valencia is developing a Compton telescope with this purpose. The system is made of three LaBr3 detector planes coupled to silicon photomultipliers (SiPMs). The first MACACO (Medical Applications CompAct COmpton camera) prototype demonstrated the viability of the proposed technology and served to identify its limitations. The second prototype features new detectors and image reconstruction codes, improving significantly the performance [1,2]. MACACO II has been characterized in the laboratory and in beam tests. It has been tested at CNA (Sevilla) with 18 MeV proton beams on a graphite target to produce 4.4 MeV gamma rays. Data have been taken with the system in different positions and beam intensities, and the target image has been reconstructed. Further tests have been carried out at KVI-CART (Groningen) with a 150 MeV proton beam impinging a PMMA target and the Bragg peak has been reconstructed in different positions. In spite of the significant progress, the system does not yet reach the necessary performance for the application and thus, possible improvements are being assessed. Tests include the evaluation of SiPMs of different types and manufacturers to enhance energy resolution and the improvement of the readout electronics. The MADDAQ board currently employed is being replaced by AliVATA, that will allow to operate the three system detectors with just one board and improve the readout speed. In addition, tests are being carried out with the PETsys system, improving significantly the detector timing resolution.
DescriptionTrabajo presentado en la XXXVII Reunión Bienal de la Real Sociedad Española de Física, celebrada en Zaragoza (España), del 15 al 20 de junio de 2019
Appears in Collections:(IFIC) Comunicaciones congresos
(I3M) Comunicaciones congresos
(CNA) Comunicaciones congresos
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