Design and performance of a system for two - dimensional readout of gas electron multiplier detectors for proton range radiography

• Autorzy: Wiącek P. , Dąbrowski W. , Fiutowski T. , Mindur B. , Zielińska A.
• Konferencja: Proceedings of the International Conference on Development and Applications of Nuclear Technologies NUTECH-2011, 11-14 September 2011, Kraków, Poland
• Języki publikacji: EN

Abstrakty

EN

The proton range radiography (PRR) technique being developed is expected to provide significant improvements in precision delivery of the therapeutic dose in the hadron therapy. The technique requires measuring residual energies and trajectories of mono-energetic protons passing through an object to be imaged. Such an imaging system can be operated in-situ before and after the treatment allowing real time monitoring of the irradiated tissue position. A detector system suitable for such applications must be capable of measuring proton tracks with submillimeter spatial resolution over area of 30 x 30 cm2. In order to limit the exposure time and obtain real-time images the detector and data acquisition must provide capability of measuring high proton rates up to 106 s-1. In this paper we present novel concept of two-dimensional (2-D) readout of the gas electron multiplier (GEM) detectors used as the position sensitive detectors. The key component of the system is an application specific integrated circuit (ASIC) named GEMROC. The GEMROC comprises 32 independent channels, each one capable of measuring the amplitude and the time of incoming signals. The positions are then reconstructed by coincidences of signals from the X- and Y-readout strips. The design and performance of the GEMROC ASIC are discussed and the results obtained for a test bench based on a smaller 10 x 10 cm2 GEM chamber are presented. The test results demonstrate clearly that with respect to the two critical parameters, i.e. the noise and the count rate capability, the developed readout system meets the requirements for clinical applications of the PRR technique.

Słowa kluczowe

EN

front-end electronics; GEM detectors; 2-D imaging; proton range radiography

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2012
• Tom: Vol. 57, No. 4
• Strony: 513--519
• Opis fizyczny: BIbliogr. 9 poz., rys.

Twórcy

autor

Wiącek P.

autor

Dąbrowski W.

autor

Fiutowski T.

autor

Mindur B.

autor

Zielińska A.

• AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. A. Mickiewicza 30, 30-059 Krakow, Poland, Tel.: [phone], Fax: [phone],

Bibliografia

• 1. Altunbas A, Capéans M, Dehmelt K et al. (2002) Construction, test and commissioning of the triple-gem tracking detector for compass. Nucl Instrum Methods A 490:177–203
• 2. Amaldi U, Bianchi A, Chang Y-H et al. (2011) Construction, test and operation of a proton range radiography system. Nucl Instrum Methods A 629;1:337–344
• 3. Brogna AS, Buzzetti S, Dąbrowski W et al. (2008) MSGCROC – an ASIC for high count rate readout of position sensitive microstrip gas chambers for thermal neutrons. In: 2008 IEEE Nuclear Science Symp Conf Record, N11-2:1482–1488
• 4. Dąbrowski W, Fiutowski T, Mindur B, Wiącek P, Zielińska A (2011) Development of an ASIC for 2-D readout of gas electron multiplier detectors. In: Proc of the 18th Int Conf Mixed Design of Integrated Circuits and Systems, MIXDES 2011:303–308
• 5. Fiutowski T, Dąbrowski W, Mindur B, Wiącek P, Zielińska A (2011) Design and performance of the GEMROC ASIC for 2-D readout of gas electron multiplier detectors. In: 2011 IEEE Nuclear Science Symp Conf Record: 1540–1544
• 6. Menichelli D, Bruzzi M, Bucciolini M et al. (2010) Characterization of a silicon strip detector and a YAG:Ce calorimeter for a proton computed radiography apparatus. IEEE Trans Nucl Sci 57:8–16
• 7. Overdick M, Czermak A, Fischer P et al. (1997) A “Bioscope” system using double-sided silicon strip detectors and self-triggering read-out chips. Nucl Instrum Methods A 392;1/3:173–177
• 8. Pedroni E, Scheib S, Böhringer T et al. (2005) Experimental characterization and physical model link of the dose distribution of scanned proton pencil beams. Phys Med Biol 50:541–561
• 9. Sistema AQUA: Advanced Quality Assurance for CNAO. http://project-aqua.web.cern.ch/project-aqua