Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Poster
HK 27.66: Poster
Dienstag, 28. März 2017, 16:45–18:45, F Foyer
Study of the spatial resolution of a monolithic LaBr3:Ce scintillator — •Michael Mayerhofer1,2, S. Aldawood1,3, T. Binder1, G. Dedes1, R. Gernhäuser5, S. Liprandi1, R. Lutter1, L. Maier5, A. Miani1,4, K. Parodi1, D.R. Schaart6, I. Valencia Lozano1, and P.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).