Skip to main content
SpringerLink
Log in

Dosimetric accuracy of AAA and acuros XB dose calculations within an air cavity for small fields of a 6-MV flattening filter-free beam

  • Published:
Journal of the Korean Physical Society Aims and scope Submit manuscript

Abstract

The purpose of this research were to verify the accuracy of dose calculation by using the analytical anisotropic algorithm (AAA) and Acuros XB (AXB) against measurements within an air cavity for small fields from a 6-MV flattening filter-free (FFF) beam. A rectangular slab phantom containing an air cavity was specially constructed for this study. Computed tomography (CT) image data sets were acquired with and without a film at four selected depths (4.5, 5.5, 6.5, and 7.5 cm) in the air cavity of the phantom for the dose calculation. The central-axis point dose (CAPD) and dose profile were measured with the film at selected depths for field sizes from 2 × 2 to 5 × 5 cm2 along the central-beam axis of a 6-MV FFF beam. The central-axis doses (CADs) and dose profiles calculated by using both the AAA and AXB were obtained by using an Eclipse treatment planning system (TPS) under the same measurement conditions. The calculation algorithms were denoted as AXB_w and AAA_w when the film was included in an air cavity of the phantom and an AXB_w/o and AAA_w/o when no film was included. The accuracy of the CAD and dose profile calculated by using both algorithms were compared with the measured CAPD and dose profile, and their differences were evaluated by using root-mean square-error (RMSE) and gamma-index analyse. The percentage difference (%Diff) of the CAD calculated by using AXB w showed good agreement (within 5%) with the measured CAPD at selected depths in the air cavity. However, the corresponding values for the other algorithms, especially AAA_w and AAA_w/o appeared to exhibit relatively high disagreement. The maximum %Diffs between the calculated CAD and the measured CAPD were 4.8% and −39.4% for the AXB_w and AXB_w/o, respectively. The %Diffs increased with decreasing field size and increasing measurement depth. For the calculated and the measured dose profiles, the RMSE values for AXB_w were within 9.3 cGy in both the inner profile and the penumbra whereas the RMSE values for AAA_w produced a wide range (52.2 − 96.8 cGy). This study demonstrated that the dose calculated by using AXB was more accurate than that calculated by using the AAA when compared to the measured dose in the air cavity. In addition, we observed that AXB_w was superior to AXB_w/o in this region with respect to the measurements.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. A. Fogliata, E. Vanetti, D. Albers, C. Brink, A. Clivio, T. Knöös, G. Nicolini and L. Cozzi, Med. Biol. 52, 1363 (2007).

    Article  Google Scholar 

  2. L. Tillikainen, H. Helminen, T. Torsti, S. Siljamäki, J. Alakuijala, J. Pyyry and W. Ulmer, Med. Biol. 53, 3821 (2008).

    Article  Google Scholar 

  3. J. B. Chung et al., Prog. Med. Phys. 25, 210 (2014).

    Article  Google Scholar 

  4. M. W. K. Kan, L. H. T. Leung and P. K. N. Yu, Med. Phys. 39, 4705 (2012).

    Article  Google Scholar 

  5. K. Bush, I. M. Gagne, S. Zavgorodni, W. Ansbacher and W. Beckham, Med. Phys. 38, 2208 (2011).

    Article  Google Scholar 

  6. S. Rana and K. Rogers, J. Med. Phys. 38, 9 (2013).

    Article  Google Scholar 

  7. C.-M. Ma and J. Li, Med. Biol. 56, 3073 (2011).

    Article  Google Scholar 

  8. M. W. L. Kan, J. T. C. Cheung, L. H. T. Leung, B. M. F. Lau and P. K. N. Yu, Med. Biol. 56, 397 (2011).

    Article  Google Scholar 

  9. H. Jung, O. Kum, Y. Han, B. Park and K. H. Cheong, J. Korean Phys. Soc. 65, 1829 (2014).

    Article  ADS  Google Scholar 

  10. S. Devic, Physica Medica. 27, 112 (2011).

    Article  Google Scholar 

  11. P. R. Almond, P. J. Biggs, B. M. Coursey, W. F. Hanson, H. M. Saiful, R. Nath and D. W. O. Rogers, Med. Phys. 26, 1847 (1999).

    Article  Google Scholar 

  12. J. M. Moran, J. Radawski and B. A. Fraass, J. Appl. Clinic. Med. Phys. 6, 62 (2005).

    Article  Google Scholar 

  13. J. Y. Park, J. W. Lee, K. S. Choi, J. S. Lee, Y. H. Kim, S. Hong and T. S. Suh, Med. Phys. 38, 6688 (2011).

    Article  Google Scholar 

  14. T. Han, J. K. Mikell, M. Salehpour and F. Mourtada, Med. Phys. 38, 2651 (2011).

    Article  Google Scholar 

  15. A. Fogliata, G. Nicolini, A. Clivio, E. Vanetti and L. Cozzi, Rad. Oncolo. 6, 82 (2011).

    Article  Google Scholar 

  16. W. Ulmer, J. Pyyry and W. Kaissl, Med. Biol. 50, 1767 (2005).

    Article  Google Scholar 

  17. C. Y. Huang, T. C. Chu, S. Y. Lin, J. P. Lin and C. Y. Hsieh, Appl. Rad. Isotop. 57, 826 (2002).

    Article  ADS  Google Scholar 

  18. B. H. Shahine, M. S. A. L. Al-Ghazi and E. El-Khatib, Med. Phys. 26, 350 (1999).

    Article  Google Scholar 

  19. P. Carrasco, N. Jornet, M. A. Duch, L. Weber, M. Ginjaume, T. Eudaldo, D. Jurado, A. Ruiz and M. Ribas, Med. Phys. 31, 2899 (2004).

    Article  Google Scholar 

  20. S. Lang, B. Shrestha, S. Graydon, F. Cavelaars, C. Linsenmeier, J. Hrbacek, S. Klöck, G. Studer and O. Riesterer, Radiother. Oncol. 106, 255 (2013).

    Article  Google Scholar 

  21. B. M. Prendergast et al., J. Appl. Clinic. Med. Phys. 14, 64 (2013).

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Biomedical Engineering and Research Institute of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul, 06591, Korea

    Sang-Won Kang & Tae-Suk Suh

  2. Department of Radiation Oncology, Seoul National University Bungdang Hospital, Seongnam, 13620, Korea

    Jin-Beom Chung, Kuen-Yong Eom, In-Ah Kim & Jae-Sung Kim

  3. Department of Radiation Oncology, Kunkuk University Medical Center, Seoul, 05030, Korea

    Jeong-Woo Lee

  4. Department of Radiation Oncology, College of Medicine, University of Florida, Florida, USA

    Ji-Yeon Park

Authors
  1. Sang-Won Kang
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Tae-Suk Suh
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Jin-Beom Chung
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Kuen-Yong Eom
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. In-Ah Kim
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. Jae-Sung Kim
    View author publications

    You can also search for this author in PubMed Google Scholar

  7. Jeong-Woo Lee
    View author publications

    You can also search for this author in PubMed Google Scholar

  8. Ji-Yeon Park
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding authors

Correspondence to Tae-Suk Suh or Jin-Beom Chung.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kang, SW., Suh, TS., Chung, JB. et al. Dosimetric accuracy of AAA and acuros XB dose calculations within an air cavity for small fields of a 6-MV flattening filter-free beam. Journal of the Korean Physical Society 67, 2138–2145 (2015). https://doi.org/10.3938/jkps.67.2138

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.3938/jkps.67.2138

Keywords

Search

Navigation