Online measurement of fluence and position for protontherapy beams

Benati, C. and Boriano, A. and Bourhaleb, F. and Cirio, R. and Cirrone, G. A. P. and Cornelius, I. and Cuttone, G. and Donetti, M. and Garelli, E. and Giordanengo, S. and Guérin, L. and La Rosa, A. and Luparia, A. and Marchetto, F. and Martin, F. and Meyroneinc, S. and Peroni, C. and Pittà, G. and Raffaele, L. and Sabini, M. G. and Valastro, L. (2004) Online measurement of fluence and position for protontherapy beams. Il nuovo cimento C, 27 (5). pp. 529-536. ISSN 1826-9885

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Tumour therapy with proton beams has been used for several decades in many centres with very good results in terms of local control and overall survival. Typical pathologies treated with this technique are located in head and neck, eye, prostate and in general at big depths or close to critical organs. The Experimental Physics Department of the University of Turin and the local Section of INFN, in collaboration with INFN Laboratori Nazionali del Sud Catania and Centre de Protontherapie de Orsay Paris, have developed detector systems that allow the measurement of beam position and fluence, obtained in real time during beam delivery. The centre in Catania (CATANA: Centro di AdroTerapia ed Applicazioni Nucleari Avanzate) has been treating patients with eye pathologies since spring 2002 using a superconducting cyclotron accelerating protons up to 62 MeV. This kind of treatments need high-resolution monitor systems and for this reason we have developed a 256-strip segmented ionisation chamber, each strip being 400 μm wide, with a total sensitive area 13 × 13 cm2. The Centre de Protontherapie de Orsay (CPO) has been operational since 1991 and features a synchrocyclotron used for eye and head and neck tumours with proton beams up to 200 MeV. The monitor system has to work on a large surface and for this purpose we have designed a pixel-segmented ionisation chamber, each pixel being 5×5 mm2, for a total active area of 16 × 16 cm2. The results obtained with two prototypes of the pixel and strip chambers demonstrate that the detectors allow the measurement of fluence and centre of gravity as requested by clinical specifications.

Item Type: Article
Uncontrolled Keywords: Proton, neutron, and heavier particle dosimetry: measurements ; Ancillary equipment
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 14 Mar 2020 12:10
Last Modified: 14 Mar 2020 12:10

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