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High-resolution fiber-optic dosimeters for microbeam radiation therapy

Journal Article


Abstract


  • Purpose: A high resolution, water equivalent, optical and passive x-ray dosimeter has been constructed

    using plastic scintillator and optical fiber. This dosimeter has a peak edge-on spatial resolution

    of 100 lm in one dimension, with a 10 lm resolution dosimeter under investigation. The

    dosimeter design has a potential application in synchrotron x-ray microbeam radiation therapy where

    a high resolution is vital for accurate dose measurements and quality assurance.

    Methods: BC-400 plastic scintillator, of thickness 100 lm, was optically coupled to an optical fiber

    with core diameter 1 mm. The end was coated in optical paint to improve sensitivity. An identical

    fiber was made without the scintillator to measure the background Cherenkov radiation induced in

    the fiber, to allow background signal subtraction. The light captured by the fibers was measured by

    PMTs. The probe system was exposed to a 6 MV, 10 9 10 cm2 LINAC x-ray field and the beam profile

    was measured at 100 cm, as well as the depth dose profile.

    Results: The measured profiles matched well with ionisation chamber data. Important beam parameters

    such as penumbra width and percent depth dose at various depths matched the ionisation chamber

    data, within uncertainty.

    Conclusions: This work demonstrates that high resolutions can be achieved with a scintillation and

    optical fiber system. The probe is water-equivalent, passive, energy independent, radiation hard and

    inexpensive, making it ideal for further improvements for use with microbeam radiation therapy.

Publication Date


  • 2017

Citation


  • Archer, J., Li, E., Petasecca, M., Lerch, M., Rosenfeld, A. & Carolan, M. (2017). High-resolution fiber-optic dosimeters for microbeam radiation therapy. Medical Physics, 44 (5), 1965-1968.

Number Of Pages


  • 3

Start Page


  • 1965

End Page


  • 1968

Volume


  • 44

Issue


  • 5

Place Of Publication


  • United States

Abstract


  • Purpose: A high resolution, water equivalent, optical and passive x-ray dosimeter has been constructed

    using plastic scintillator and optical fiber. This dosimeter has a peak edge-on spatial resolution

    of 100 lm in one dimension, with a 10 lm resolution dosimeter under investigation. The

    dosimeter design has a potential application in synchrotron x-ray microbeam radiation therapy where

    a high resolution is vital for accurate dose measurements and quality assurance.

    Methods: BC-400 plastic scintillator, of thickness 100 lm, was optically coupled to an optical fiber

    with core diameter 1 mm. The end was coated in optical paint to improve sensitivity. An identical

    fiber was made without the scintillator to measure the background Cherenkov radiation induced in

    the fiber, to allow background signal subtraction. The light captured by the fibers was measured by

    PMTs. The probe system was exposed to a 6 MV, 10 9 10 cm2 LINAC x-ray field and the beam profile

    was measured at 100 cm, as well as the depth dose profile.

    Results: The measured profiles matched well with ionisation chamber data. Important beam parameters

    such as penumbra width and percent depth dose at various depths matched the ionisation chamber

    data, within uncertainty.

    Conclusions: This work demonstrates that high resolutions can be achieved with a scintillation and

    optical fiber system. The probe is water-equivalent, passive, energy independent, radiation hard and

    inexpensive, making it ideal for further improvements for use with microbeam radiation therapy.

Publication Date


  • 2017

Citation


  • Archer, J., Li, E., Petasecca, M., Lerch, M., Rosenfeld, A. & Carolan, M. (2017). High-resolution fiber-optic dosimeters for microbeam radiation therapy. Medical Physics, 44 (5), 1965-1968.

Number Of Pages


  • 3

Start Page


  • 1965

End Page


  • 1968

Volume


  • 44

Issue


  • 5

Place Of Publication


  • United States