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ST: Fachverband Strahlen- und Medizinphysik

ST 4: Poster Session

ST 4.1: Poster

Mittwoch, 21. März 2018, 14:00–15:30, Phys-HS P

Compact signal processing of a Compton camera system for medical imaging — •Silvia Liprandi¹, Vasiliki Anagnostatou¹, Tim Binder¹, George Dedes¹, Maria Kawula¹, Florian Lüke², Robert Schneider², Ingrid I. Valencia Lozano¹, Katia Parodi¹, and Peter G. Thirolf¹ — ¹LMU München, Germany — ²Mesytec GmbH, Putzbrunn, Germany

At LMU in Garching we are developing a Compton camera for ion beam range verification in particle therapy. The system is designed to detect prompt γ-rays induced by nuclear reactions during the irradiation of tissues. Our prototype consists of a stack of 6 double-sided silicon strip detectors (2x128 ch. each) as scatterers and an absorber formed by a LaBr₃(Ce) scintillator coupled to a multi-anode (8x8 or 16x16) photomultiplier (PMT). A CeBr₃ scintillator is also under comparative investigation. The system requires the signal processing of up to 2000 channels: the previous (ASIC-based) readout electronics provided several shortcomings (input polarities acceptance, trigger capability, noise level and rate limitations) that were now removed by an upgrade. We are presently testing a compact frontend-board and VME-based signal processing and DAQ electronics built from discrete components. The system is capable of handling data rates up to 30 MB/s. First tests offline and online using the new readout and data acquisition system will be presented. This work was supported by the DFG Cluster of Excellence MAP (Centre of Advanced Photonics) and CALA (Centre for Advanced Laser Applications).