Mainz 2014 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 3: Biomedical Imaging II

ST 3.7: Talk

Tuesday, March 25, 2014, 18:15–18:30, RW 2

High-Rate Capable Micromegas Detectors for Ion Transmission Tomography — •Jonathan Bortfeldt¹, Otmar Biebel¹, Bernhard Flierl¹, Ralf Hertenberger¹, Tiago Marcelos², Katia Parodi², and Ilaria Rinaldi^2,3 — ¹LS Schaile, LMU München — ²LS Parodi, LMU München — ³Heidelberg University Hospital, Heidelberg

The energy loss of transmitted ions from therapeutic ion beams can be used as low dose imaging method. Single particle tracking and range measurement is expected to improve the resolution. A detector system consisting of three Micromegas (MICRO MEsh GAS) detectors has been tested in high-rate proton and carbon-ion beams at the Heidelberger Ionenstrahl-Therapiezentrum. Micromegas are high-rate capable micro-strip gas detectors, originally developed for High Energy Physics experiments.

Single particle tracking was possible for hit rates up to 80 MHz and at all available energies for protons and carbon-ions of up to 230 MeV/u and 430 MeV/u. The detectors ran stably up to the highest rates of 2 GHz. We compare the performance of a resistive strip and a novel floating strip Micromegas and present a Hough transform based method for track reconstruction. We discuss the achieved spatial resolution and high-rate capability.