Design and characterization of the beam monitor detectors of the Italian National Center of Oncological Hadron-therapy (CNAO)
Autor: | Cristiana Peroni, M. A. Garella, Vincenzo Monaco, M. Mucchi, M. Scalise, Roberto Cirio, Abdolkazem Ansarinejad, G. Alampi, Simona Giordanengo, M. Donetti, I. A. Pecka, Flavio Marchetto, Roberto Sacchi, Caterina Tomba |
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Přispěvatelé: | Institut des Nanotechnologies de Lyon (INL), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) |
Jazyk: | angličtina |
Rok vydání: | 2013 |
Předmět: |
radiation detector
Nuclear and High Energy Physics STRIPS 01 natural sciences Particle detector 030218 nuclear medicine & medical imaging law.invention 03 medical and health sciences 0302 clinical medicine Optics ionization chamber law hadrontherapy Ionization 0103 physical sciences Instrumentation ComputingMilieux_MISCELLANEOUS Physics [PHYS]Physics [physics] Pixel 010308 nuclear & particles physics business.industry Detector Ionization chamber Electrode business Beam (structure) |
Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2013, 698, pp.202-207. ⟨10.1016/j.nima.2012.10.004⟩ |
ISSN: | 0168-9002 |
DOI: | 10.1016/j.nima.2012.10.004⟩ |
Popis: | A new hadron-therapy facility implementing an active beam scanning technique has been developed at the Italian National Center of Oncological Hadron-therapy (CNAO). This paper presents the design and the characterization of the beam monitor detectors developed for the on-line monitoring and control of the dose delivered during a treatment at CNAO. The detectors are based on five parallel-plate transmission ionization chambers with either a single large electrode or electrodes segmented in 128 strips (strip chambers) and 32×32 pixels (pixel chamber). The detectors are arranged in two independent boxes with an active area larger than 200×200 mm 2 and a total water equivalent thickness along the beam path of about 0.9 mm. A custom front-end chip with 64 channels converts the integrated ionization channels without dead-time. The detectors were tested at the clinical proton beam facility of the Paul Scherrer Institut (PSI) which implements a spot scanning technique, each spot being characterized by a predefined number of protons delivered with a pencil beam in a specified point of the irradiation field. The short-term instability was measured by delivering several identical spots in a time interval of few tenths of seconds and is found to be lower than 0.3%. The non-uniformity, measured by delivering sequences of spots in different points of the detector surface, results to be lower than 1% in the single electrode chambers and lower than 1.5% in the strip and pixel chambers, reducing to less than 0.5% and 1% in the restricted 100×100 mm 2 central area of the detector. |
Databáze: | OpenAIRE |
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