Dosimetric accuracy of the Acuros XB and Anisotropic analytical algorithm near interface of the different density media for the small fields of a 6-MV flattening-filter-free beam

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Kang s.w.; Chung j.b.; LEE J.W.; KIM M.J.; KIM Y.L.; KIM J.S.; Eom k.y.; Kim I.A.; Suh t.s.

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Journal: International Journal of Radiation Research Year:2017 | Volume:15 | Issue:2 Page(s): 157-165

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Title

Dosimetric accuracy of the Acuros XB and Anisotropic analytical algorithm near interface of the different density media for the small fields of a 6-MV flattening-filter-free beam

Author(s)

Keywords

Acuros XB

anisotropic analytical algorithm

heterogeneous media

FFF

interface

Abstract

Background: This study was conducted to assess the accuracy of dose calcula on near the air-phantom interface of a heterogeneous phantom for Acuros XB (AXB) and Anisotropic Analy cal Algorithm (AAA) algorithm of a 6-MV fla! ening-filter-free beam, compared with film measurements. Materials and Methods: A phantom included air gap was specially manufactured for this study. In order to evaluate the dose near air gapphantom interface, Eclipse treatment planning system equipped both AXB and AAA was used for the dose calcula ons. Measurements in this region were performed with radiochromic film. The central-axis dose (CAD) and offaxis dose (OAD) between calcula ons and measurements were analyzed for various field sizes and air gaps. The root-mean-square-error (RMSE) was used to evaluate the difference between the calculated and measured OAD. In order to quan fy agreement between the calculated and measured dose distribu ons, the gamma analysis was performed with the 2%/2 mm and 3%/3 mm criteria. Results: For all fields traveling through 1 and 3 cm air gap, the maximum difference in the calculated CAD was-5. 3% for AXB and 214. 8% for AAA, compared to the measured CAD. For the RMSE between the calculated and measured OAD, the calculated OAD using AXB showed interval in the RMSE (from 4. 4 to 12. 7) while using AAA indicated broad (from 7. 7 to 101. 0). In addi on, the gamma passing rates showed that AXB was higher agreement than AAA. Conclusion: This study demonstrated that AXB was more accurate in heterogeneous media near air-phantom interface than AAA when comparing the measured data.

Cites

Evaluation of dosimetric characteristics of diodes and ionization chambers in small megavoltage photon field dosimetry

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APA: Copy

Kang, s.w., Chung, j.b., LEE, J.W., KIM, M.J., KIM, Y.L., KIM, J.S., Eom, k.y., Kim, I.A., & Suh, t.s.. (2017). Dosimetric accuracy of the Acuros XB and Anisotropic analytical algorithm near interface of the different density media for the small fields of a 6-MV flattening-filter-free beam. INTERNATIONAL JOURNAL OF RADIATION RESEARCH, 15(2), 157-165. SID. https://sid.ir/paper/286799/en

Vancouver: Copy

Kang s.w., Chung j.b., LEE J.W., KIM M.J., KIM Y.L., KIM J.S., Eom k.y., Kim I.A., Suh t.s.. Dosimetric accuracy of the Acuros XB and Anisotropic analytical algorithm near interface of the different density media for the small fields of a 6-MV flattening-filter-free beam. INTERNATIONAL JOURNAL OF RADIATION RESEARCH[Internet]. 2017;15(2):157-165. Available from: https://sid.ir/paper/286799/en

IEEE: Copy

s.w. Kang, j.b. Chung, J.W. LEE, M.J. KIM, Y.L. KIM, J.S. KIM, k.y. Eom, I.A. Kim, and t.s. Suh, “Dosimetric accuracy of the Acuros XB and Anisotropic analytical algorithm near interface of the different density media for the small fields of a 6-MV flattening-filter-free beam,” INTERNATIONAL JOURNAL OF RADIATION RESEARCH, vol. 15, no. 2, pp. 157–165, 2017, [Online]. Available: https://sid.ir/paper/286799/en

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