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First measurements with a plastic scintillation dosimeter at the Australian MRI-LINAC

Journal Article


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Abstract


  • MRI-LINACs combine MRI and LINAC technologies with the potential for image guided radiation therapy with optimal soft-tissue contrast. In this work, we present the advantages and limitations of plastic scintillation dosimeters (PSDs) for relative dosimetry with MRI-LINACs. PSDs possess many desirable qualities, including magnetic field insensitivity and irradiation angle independence, which are expected to make them suitable for dosimetry with MRI-LINACs. An in-house PSD was used to measure field size output factors as well as a percent depth dose distribution and the beam quality index TPR20/10 at a [Formula: see text] cm2 field size. Measurements were repeated with a Scanditronix/Wellhofer FC65-G ionisation chamber and PTW 60019 microDiamond detector for comparison. Relative differences were calculated between the three detectors, where the mean difference in dose was 1.2% between the PSD and ionisation chamber, 1.9% between the PSD and microDiamond detector and 1.3% between the microDiamond detector and the ionisation chamber. The closeness between the three mean differences in doses suggests that PSDs are feasible for relative dosimetry with MRI-LINACs.

UOW Authors


  •   Madden, Levi (external author)
  •   Archer, James (external author)
  •   Li, Enbang
  •   Jelen, Urszula (external author)
  •   Dong, B (external author)
  •   Roberts, Natalia (external author)
  •   Holloway, Lois (external author)
  •   Rosenfeld, Anatoly B.

Publication Date


  • 2019

Citation


  • Madden, L., Archer, J., Li, E., Jelen, U., Dong, B., Roberts, N., Holloway, L. & Rosenfeld, A. (2019). First measurements with a plastic scintillation dosimeter at the Australian MRI-LINAC. Physics in Medicine and Biology, 64 (17), 175015-1-175015-8.

Scopus Eid


  • 2-s2.0-85071784030

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4189&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/3170

Start Page


  • 175015-1

End Page


  • 175015-8

Volume


  • 64

Issue


  • 17

Place Of Publication


  • United Kingdom

Abstract


  • MRI-LINACs combine MRI and LINAC technologies with the potential for image guided radiation therapy with optimal soft-tissue contrast. In this work, we present the advantages and limitations of plastic scintillation dosimeters (PSDs) for relative dosimetry with MRI-LINACs. PSDs possess many desirable qualities, including magnetic field insensitivity and irradiation angle independence, which are expected to make them suitable for dosimetry with MRI-LINACs. An in-house PSD was used to measure field size output factors as well as a percent depth dose distribution and the beam quality index TPR20/10 at a [Formula: see text] cm2 field size. Measurements were repeated with a Scanditronix/Wellhofer FC65-G ionisation chamber and PTW 60019 microDiamond detector for comparison. Relative differences were calculated between the three detectors, where the mean difference in dose was 1.2% between the PSD and ionisation chamber, 1.9% between the PSD and microDiamond detector and 1.3% between the microDiamond detector and the ionisation chamber. The closeness between the three mean differences in doses suggests that PSDs are feasible for relative dosimetry with MRI-LINACs.

UOW Authors


  •   Madden, Levi (external author)
  •   Archer, James (external author)
  •   Li, Enbang
  •   Jelen, Urszula (external author)
  •   Dong, B (external author)
  •   Roberts, Natalia (external author)
  •   Holloway, Lois (external author)
  •   Rosenfeld, Anatoly B.

Publication Date


  • 2019

Citation


  • Madden, L., Archer, J., Li, E., Jelen, U., Dong, B., Roberts, N., Holloway, L. & Rosenfeld, A. (2019). First measurements with a plastic scintillation dosimeter at the Australian MRI-LINAC. Physics in Medicine and Biology, 64 (17), 175015-1-175015-8.

Scopus Eid


  • 2-s2.0-85071784030

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4189&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/3170

Start Page


  • 175015-1

End Page


  • 175015-8

Volume


  • 64

Issue


  • 17

Place Of Publication


  • United Kingdom