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A beam model for focused proton pencil beams
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Radiation Science. The Skandion Clinic, Uppsala, Sweden.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Radiation Science. ACMIT Gmbh, A-2700 Wiener Neustadt, Austria.
Skandion Clin, Uppsala, Sweden;DCPT, Aarhus, Denmark.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Radiation Science.
2018 (English)In: Physica medica (Testo stampato), ISSN 1120-1797, E-ISSN 1724-191X, Vol. 52, p. 27-32Article in journal (Refereed) Published
Abstract [en]

Introduction: We present a beam model for Monte Carlo simulations of the IBA pencil beam scanning dedicated nozzle installed at the Skandion Clinic. Within the nozzle, apart from entrance and exit windows and the two ion chambers, the beam traverses vacuum, allowing for a beam that is convergent downstream of the nozzle exit. Materials and methods: We model the angular, spatial and energy distributions of the beam phase space at the nozzle exit with single Gaussians, controlled by seven energy dependent parameters. The parameters were determined from measured profiles and depth dose distributions. Verification of the beam model was done by comparing measured and GATE acquired relative dose distributions, using plan specific log files from the machine to specify beam spot positions and energy. Results: GATE-based simulations with the acquired beam model could accurately reproduce the measured data. The gamma index analysis comparing simulated and measured dose distributions resulted in > 95% global gamma index pass rates (3%/2 mm) for all depths. Conclusion: The developed beam model was found to be sufficiently accurate for use with GATE e.g. for applications in quality assurance (QA) or patient motion studies with the IBA pencil beam scanning dedicated nozzles.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 52, p. 27-32
Keywords [en]
Proton therapy, Monte Carlo, Beam model
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:uu:diva-364002DOI: 10.1016/j.ejmp.2018.06.007ISI: 000442110000004PubMedID: 30139606OAI: oai:DiVA.org:uu-364002DiVA, id: diva2:1259713
Funder
Swedish Childhood Cancer FoundationSwedish Radiation Safety AuthorityAvailable from: 2018-10-30 Created: 2018-10-30 Last updated: 2018-10-30Bibliographically approved

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Almhagen, ErikBoersma, David J.Ahnesjö, Anders

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