Quality assurance of carbon ion and proton beams: A feasibility study for using the 2D MatriXX detector |
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| Institution: | 1. Istituto Nazionale di Fisica Nucleare, sez. di Torino, via P. Giuria 1, I-10125 Torino, Italy;2. Dipartimento di Fisica dell’Università di Torino, via P. Giuria 1, I-10125 Torino, Italy;3. Centro Nazionale Adroterapia Oncologica (CNAO), Strada Campeggi 53, I-27100 Pavia, Italy;4. Dipartimento di Elettronica e Telecomunicazioni del Politecnico di Torino, Corso Duca degli Abruzzi, 24, I-10129 Torino, Italy;1. Department of Applied Radiobiology, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology Cracow Branch, 11 Garncarska Street, Cracow 31-115, Poland;2. Department of Medical Physics, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology Cracow Branch, 11 Garncarska Street, Cracow 31-115, Poland;1. Liverpool and Macarthur Cancer Therapy Centres and Ingham Institute, Liverpool, New South Wales, Australia;2. University of New South Wales, Sydney, New South Wales, Australia;3. Institute of Medical Physics, School of Physics, University of Sydney, Sydney, New South Wales, Australia;4. Centre for Medical Radiation Physics, University of Wollongong, Wollongong, New South Wales, Australia;1. Department of Physics, Faculty of Philosophy, Sciences and Letters at Ribeirão Preto, University of São Paulo, Av. Bandeirantes 3900, 14040-901, Monte Alegre, Ribeirão Preto, São Paulo, Brazil;2. Radiotherapy Department, Ribeirão Preto Medical School Hospital and Clinics, University of São Paulo, Av. Bandeirantes 3900, 14040-900, Monte Alegre, Ribeirão Preto, São Paulo, Brazil;1. Proton Therapy Unit, Hospital of Trento, Azienda Provinciale per i Servizi Sanitari (APSS), Trento, Italy;2. Medical Physics Department, Hospital of Trento, Azienda Provinciale per i Servizi Sanitari (APSS), Trento, Italy;1. Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas;2. Medical Physics Program, The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, Texas;3. Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas;4. Centre for Cancer Research and Cell Biology, School of Medicine, Dentistry and Biomedical Sciences, Queen''s University Belfast, Belfast, United Kingdom;6. National Physical Laboratory, Hampton Road, Teddington, Middlesex, United Kingdom;5. University of Surrey, Department of Physics, Guilford, United Kingdom;1. Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, UK;2. Centre for Cancer Research, Queens University Belfast, UK |
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| Abstract: | PurposeThe quality assurance (QA) procedures in particle therapy centers with active beam scanning make extensive use of films, which do not provide immediate results. The purpose of this work is to verify whether the 2D MatriXX detector by IBA Dosimetry has enough sensitivity to replace films in some of the measurements.MethodsMatriXX is a commercial detector composed of 32 × 32 parallel plate ionization chambers designed for pre-treatment dose verification in conventional radiation therapy. The detector and GAFCHROMIC® films were exposed simultaneously to a 131.44 MeV proton and a 221.45 MeV/u carbon-ion therapeutic beam at the CNAO therapy center of Pavia – Italy, and the results were analyzed and compared.ResultsThe sensitivity MatriXX on the beam position, beam width and field flatness was investigated. For the first two quantities, a method for correcting systematic uncertainties, dependent on the beam size, was developed allowing to achieve a position resolution equal to 230 μm for carbon ions and less than 100 μm for protons. The beam size and the field flatness measured using MatriXX were compared with the same quantities measured with the irradiated film, showing a good agreement.ConclusionsThe results indicate that a 2D detector such as MatriXX can be used to measure several parameters of a scanned ion beam quickly and precisely and suggest that the QA would benefit from a new protocol where the MatriXX detector is added to the existing systems. |
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| Keywords: | Quality assurance Active beam scanning Particle therapy MatriXX |
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