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Current Directions in Biomedical Engineering

Joint Journal of the German Society for Biomedical Engineering in VDE and the Austrian and Swiss Societies for Biomedical Engineering

Editor-in-Chief: Dössel, Olaf

Editorial Board: Augat, Peter / Buzug, Thorsten M. / Haueisen, Jens / Jockenhoevel, Stefan / Knaup-Gregori, Petra / Kraft, Marc / Lenarz, Thomas / Leonhardt, Steffen / Malberg, Hagen / Penzel, Thomas / Plank, Gernot / Radermacher, Klaus M. / Schkommodau, Erik / Stieglitz, Thomas / Urban, Gerald A.


CiteScore 2018: 0.47

Source Normalized Impact per Paper (SNIP) 2018: 0.377

Open Access
Online
ISSN
2364-5504
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Experimental analysis of correction factors for reference dosimetry in a magnetic field

Nicole Brand
  • Corresponding author
  • Universitätsklinikum für Radioonkologie Tübingen, Sektion Biomedizinische Physik, Hoppe-Seyler-Str.3, 72076 Tübingen, Germany
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  • Other articles by this author:
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/ Stefan Pojtinger
  • Universitätsklinikum für Radioonkologie Tübingen, Sektion Biomedizinische Physik, Hoppe-Seyler-Str.3, 72076 Tübingen, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Savas Tsitsekidis
  • Universitätsklinikum für Radioonkologie Tübingen, Bereich Medizinische Physik, Hoppe-Seyler-Str.3, 72076 Tübingen, Germany
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  • De Gruyter OnlineGoogle Scholar
/ Daniela Thorwarth
  • Universitätsklinikum für Radioonkologie Tübingen, Sektion Biomedizinische Physik, Hoppe-Seyler-Str.3, 72076 Tübingen, Germany
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  • De Gruyter OnlineGoogle Scholar
/ Oliver S. Dohm
  • Universitätsklinikum für Radioonkologie Tübingen, Bereich Medizinische Physik, Hoppe-Seyler-Str.3, 72076 Tübingen, Germany
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  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-09-07 | DOI: https://doi.org/10.1515/cdbme-2017-0170

Abstract

Today, hybrid systems of linear accelerator and MRI scanner are clinically available. Therefore it is important to investigate the feasibility of reference dosimetry with ionization chambers in the presence of a magnetic field and determine correction factors. In this work, correction factors under various conditions that influence the chamber response were experimentally investigated, using a conventional 6 MV linear accelerator together with a stand-alone magnet. We found that the correction factor for a PTW31010 ionization chamber ranges from 0.9873 to 1.009 depending on the magnetic field strength, magnetic field orientation and magnetic field size. The phantom material also does have an influence on the measured signal. Therefore, reference dosimetry with ionization chambers in the presence of a magnetic field is feasible, but requires dedicated correction factors, which depend on the experimental setup.

Keywords: ionization chamber; reference dosimetry; magnetic field; correction factor; MR-linac

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Published Online: 2017-09-07


Citation Information: Current Directions in Biomedical Engineering, Volume 3, Issue 2, Pages 803–805, ISSN (Online) 2364-5504, DOI: https://doi.org/10.1515/cdbme-2017-0170.

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©2017 Nicole Brand et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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