Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 69: Anwendungen kernphysikalischer Methoden
HK 69.6: Vortrag
Freitag, 25. März 2011, 15:30–15:45, C-2
Monitoring of laser-accelerated particle beams for hadron therapy via Compton tracking — •C. Lang1, D. Habs1, 4, P.G. Thirolf1, A. Zoglauer3, G. Kanbach2, R. Diehl2, J. Schreiber4, and T. Tajima1, 4 — 1LMU, München — 2MPE, München — 3SSL, Berkeley — 4MPQ, Garching
Presently large efforts have been achieved towards the development of hadron cancer therapy based on laser-accelerated ion (p, C) beams, particularly aiming at the treatment of small tumors (few mm size).
Thus precise monitoring of the ion track is mandatory. Conventional PET technology suffers from limited signal strength and precision of locating the source position. We envisage to use Compton tracking, i.e. determining energy and momentum of Compton photons and electrons, emitted along the ion track in the irradiated soft tissue. Confining the Compton cone by tracking the scattered electron will allow to significantly improve on the position resolution.
Monte Carlo simulations have been performed to characterize the achievable position resolution and efficiency of a Compton camera. We estimate a resolution of 2 mm (1 mm; 5 mm) FWHM at 2 MeV (5 MeV; 0.5 MeV). An efficiency of 1.4*10−3 (4.6*10−6) at 0.5 MeV (2 MeV) is envisaged. Optimized for an energy range between 0.5 MeV and 5 MeV, we plan for a system of 5 layers of double-sided Si strip detectors (for Compton electron tracking) and an additional LaBr3:Ce calorimeter, read out by a segmented photomultiplier tube.
The authors acknowledge the support by the DFG Cluster of Excellence "Munich-Centre for Advanced Photonics" (MAP).