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ST: Fachverband Strahlen- und Medizinphysik

ST 7: Poster Session

ST 7.9: Poster

Donnerstag, 30. März 2017, 14:00–16:15, JUR Foyer

Study of the spatial resolution of a monolithic LaBr₃:Ce scintillator — •Michael Mayerhofer^1,2, Saad Aldawood^1,3, Tim Binder¹, George Dedes¹, Roman Gernhäuser⁵, Silvia Liprandi¹, Rudi Lutter¹, Ludwig Maier⁵, Agnese Miani^1,4, Katia Parodi¹, Dennis R. Schaart⁶, Ingrid Valencia Lozano¹, and Peter G. Thirolf¹ — ¹LMU München, Germany — ²Univ. Hamburg, Germany — ³King Saud Univ., Riyadh, Saudi Arabia — ⁴Univ. degli Studi di Milano, Italy — ⁵TU München, Germany — ⁶TU Delft, Netherlands

We develop a Compton camera for ion-beam range verification during hadron therapy by detecting prompt γ rays from nuclear reactions between the beam and organic tissue. The camera consists of a scatterer (6 layers of double-sided Si-strip detectors) and a LaBr₃(Ce) scintillator as absorber, read out by a multianode photomultiplier. Key ingredient of the γ-source reconstruction is the determination of the γ-ray interaction position in the scintillator. This contribution will focus on the "k-Nearest Neighbor" (k-NN) and the "Categorical Average Pattern" (CAP) algorithm [1]. Both require a large reference library of 2D light amplitude distributions, derived by scanning the scintillator front surface with tightly collimated ⁶⁰Co and ¹³⁷Cs sources and a fine step size (0.5 mm). The determination of the spatial resolution as a function of the photon energy, the PMT granularity and the systematic performance of the two algorithms will be present.

This work was supported by the DFG Cluster of Excellence Munich Centre for Advanced Photonics (MPA).

[1]van Dam et al., IEEE TNS 58 (2011).