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Tissue equivalency of phantom materials for neutron dosimetry in proton therapy

Journal Article


Abstract


  • Purpose: Previous Monte Carlo and experimental studies involving secondary neutrons in proton

    therapy have employed a number of phantom materials that are designed to represent human tissue.

    In this study, the authors determined the suitability of common phantom materials for dosimetry of

    secondary neutrons, specifically for pediatric and intracranial proton therapy treatments.

    Methods: This was achieved through comparison of the absorbed dose and dose equivalent from

    neutrons generated within the phantom materials and various ICRP tissues. The phantom materials

    chosen for comparison were Lucite, liquid water, solid water, and A150 tissue equivalent plastic.

    These phantom materials were compared to brain, muscle, and adipose tissues.

    Results: The magnitude of the doses observed were smaller than those reported in previous experi-

    mental and Monte Carlo studies, which incorporated neutrons generated in the treatment head. The

    results show that for both neutron absorbed dose and dose equivalent, no single phantom material

    gives agreement with tissue within 5% at all the points considered. Solid water gave the smallest

    mean variation with the tissues out of field where neutrons are the primary contributor to the total

    dose.

    Conclusions: Of the phantom materials considered, solid water shows best agreement with tissues

    out of field.

Publication Date


  • 2009

Citation


  • Dowdell, S., Clasie, B., Wroe, A., Guatelli, S., Metcalfe, P. E., Schulte, R. & Rozenfeld, A. (2009). Tissue equivalency of phantom materials for neutron dosimetry in proton therapy. Medical Physics, 36 (12), 5412-5419.

Scopus Eid


  • 2-s2.0-72049095540

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/1695

Number Of Pages


  • 7

Start Page


  • 5412

End Page


  • 5419

Volume


  • 36

Issue


  • 12

Abstract


  • Purpose: Previous Monte Carlo and experimental studies involving secondary neutrons in proton

    therapy have employed a number of phantom materials that are designed to represent human tissue.

    In this study, the authors determined the suitability of common phantom materials for dosimetry of

    secondary neutrons, specifically for pediatric and intracranial proton therapy treatments.

    Methods: This was achieved through comparison of the absorbed dose and dose equivalent from

    neutrons generated within the phantom materials and various ICRP tissues. The phantom materials

    chosen for comparison were Lucite, liquid water, solid water, and A150 tissue equivalent plastic.

    These phantom materials were compared to brain, muscle, and adipose tissues.

    Results: The magnitude of the doses observed were smaller than those reported in previous experi-

    mental and Monte Carlo studies, which incorporated neutrons generated in the treatment head. The

    results show that for both neutron absorbed dose and dose equivalent, no single phantom material

    gives agreement with tissue within 5% at all the points considered. Solid water gave the smallest

    mean variation with the tissues out of field where neutrons are the primary contributor to the total

    dose.

    Conclusions: Of the phantom materials considered, solid water shows best agreement with tissues

    out of field.

Publication Date


  • 2009

Citation


  • Dowdell, S., Clasie, B., Wroe, A., Guatelli, S., Metcalfe, P. E., Schulte, R. & Rozenfeld, A. (2009). Tissue equivalency of phantom materials for neutron dosimetry in proton therapy. Medical Physics, 36 (12), 5412-5419.

Scopus Eid


  • 2-s2.0-72049095540

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/1695

Number Of Pages


  • 7

Start Page


  • 5412

End Page


  • 5419

Volume


  • 36

Issue


  • 12