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Experimental and Monte Carlo verification of Acuros XB calculations near low and high density heterogeneities

Journal Article


Abstract


  • The purpose of this study was to examine the accuracy of AcurosXB and

    AAA algorithms near low and high density heterogeneities of different

    densities using EBT2 film, MOSFET detector “MOSkin” and Monte Carlo

    calculations using BEAMnrc/DOSXYZnrc.

    Three different interfaces were used that included a solid water phantom with

    2x2x30cm3 rectangular air gap, rectangular steel insert, and a slab of water

    embedded between two slabs of lung material. 6MV photon beam with field

    size of 10x10cm2 was used for the first two geometries and a 3x3cm2-field

    was used for the third. Percentage Depth Doses were measured and

    calculated at the beam central axis. Calculation voxel of 0.1x0.1x0.1cm3 was

    used by all three algorithms.

    For all configurations, AcurosXB and AAA agreed to within ±1.3% with MC

    before the inhomogeneity. The PDD measurements using MOSkin and EBT2

    in water, apart from 0.2cm layer near heterogeneity, agreed with the MC

    within ±2.2%. Within 0.1cm before the water-air interface AcurosXB and

    AAA overestimated the dose by 4.7% and 1.6%, respectively. Whereas, in

    the 0.1cm beyond the air-water interface, AcurosXB and AAA overestimated

    the dose by 2.4% and 16.2% respectively. In the 0.1cm before the water-steel

    interface, AcurosXB overestimated the dose by 4.7% and AAA

    underestimated the dose by 9.5%; beyond the steel-water interface AcurosXB

    and AAA overestimated the dose by 3.6% and 7.7% respectively. For the

    lung phantom configuration, AcurosXB and AAA were in agreement with

    MC within 2% throughout the phantom.

    These results demonstrate improved performance of AcurosXB as compared

    to AAA in considered conditions.

UOW Authors


  •   Alhakeem, Eyad A. (external author)
  •   Alshaikh, Sami (external author)
  •   Rosenfeld, Anatoly B.
  •   Zavgorodni, Sergei F. (external author)

Publication Date


  • 2012

Citation


  • Alhakeem, E., Alshaikh, S., Rozenfeld, A. & Zavgorodni, S. (2012). Experimental and Monte Carlo verification of Acuros XB calculations near low and high density heterogeneities. Medical Physics, 39 (7), 4619-4619.

Scopus Eid


  • 2-s2.0-85024381660

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5237

Number Of Pages


  • 0

Start Page


  • 4619

End Page


  • 4619

Volume


  • 39

Issue


  • 7

Place Of Publication


  • United States

Abstract


  • The purpose of this study was to examine the accuracy of AcurosXB and

    AAA algorithms near low and high density heterogeneities of different

    densities using EBT2 film, MOSFET detector “MOSkin” and Monte Carlo

    calculations using BEAMnrc/DOSXYZnrc.

    Three different interfaces were used that included a solid water phantom with

    2x2x30cm3 rectangular air gap, rectangular steel insert, and a slab of water

    embedded between two slabs of lung material. 6MV photon beam with field

    size of 10x10cm2 was used for the first two geometries and a 3x3cm2-field

    was used for the third. Percentage Depth Doses were measured and

    calculated at the beam central axis. Calculation voxel of 0.1x0.1x0.1cm3 was

    used by all three algorithms.

    For all configurations, AcurosXB and AAA agreed to within ±1.3% with MC

    before the inhomogeneity. The PDD measurements using MOSkin and EBT2

    in water, apart from 0.2cm layer near heterogeneity, agreed with the MC

    within ±2.2%. Within 0.1cm before the water-air interface AcurosXB and

    AAA overestimated the dose by 4.7% and 1.6%, respectively. Whereas, in

    the 0.1cm beyond the air-water interface, AcurosXB and AAA overestimated

    the dose by 2.4% and 16.2% respectively. In the 0.1cm before the water-steel

    interface, AcurosXB overestimated the dose by 4.7% and AAA

    underestimated the dose by 9.5%; beyond the steel-water interface AcurosXB

    and AAA overestimated the dose by 3.6% and 7.7% respectively. For the

    lung phantom configuration, AcurosXB and AAA were in agreement with

    MC within 2% throughout the phantom.

    These results demonstrate improved performance of AcurosXB as compared

    to AAA in considered conditions.

UOW Authors


  •   Alhakeem, Eyad A. (external author)
  •   Alshaikh, Sami (external author)
  •   Rosenfeld, Anatoly B.
  •   Zavgorodni, Sergei F. (external author)

Publication Date


  • 2012

Citation


  • Alhakeem, E., Alshaikh, S., Rozenfeld, A. & Zavgorodni, S. (2012). Experimental and Monte Carlo verification of Acuros XB calculations near low and high density heterogeneities. Medical Physics, 39 (7), 4619-4619.

Scopus Eid


  • 2-s2.0-85024381660

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5237

Number Of Pages


  • 0

Start Page


  • 4619

End Page


  • 4619

Volume


  • 39

Issue


  • 7

Place Of Publication


  • United States