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Comparison between Acuros XB and Brainlab Monte Carlo algorithms for photon dose calculation.

M Mißlbeck1, P Kneschaurek

  • 1Klinik und Poliklinik für Strahlentherapie und Radiologische Onkologie, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, 81675, Munich, Germany. Misslbeck@lrz.tu-muenchen.de

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Summary

The Acuros® XB and XVMC dose calculation algorithms showed minor differences in artificial phantoms, unlike the AAA algorithm. Clinical cases revealed no significant differences in dose-volume histograms between the three algorithms.

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Accurate dose calculation is crucial for effective radiation therapy planning.
  • Advanced algorithms like Acuros® XB (AXB), XVMC (Monte Carlo), and Anisotropic Analytical Algorithm (AAA) are used for this purpose.

Purpose of the Study:

  • To compare the dose calculation accuracy of Varian's Acuros® XB (AXB) and Brainlab's XVMC (Monte Carlo) algorithms against Varian's AAA algorithm.
  • To evaluate the performance of these algorithms in both artificial phantom and clinical patient scenarios.

Main Methods:

  • Dose calculations were performed using AXB, XVMC, and AAA algorithms.
  • Comparisons were made using a slab phantom (water-bone-lung layers) and a lung phantom.
  • Depth-dose curves and profiles were analyzed in phantoms.
  • Clinical patient CT data was used to recalculate plans and compare dose-volume histograms (DVHs).

Main Results:

  • AXB and XVMC showed minimal differences in depth doses and profiles within artificial phantoms.
  • AAA exhibited deviations up to 13% in depth dose and a few percent in lung phantom profiles.
  • In clinical cases, DVHs for all three algorithms were comparable for open fields.

Conclusions:

  • AAA demonstrates differences at tissue boundaries in artificial phantoms compared to AXB and XVMC.
  • These discrepancies were not observed in the dose-volume histograms of planning target volumes for real patient CTs.
  • AXB and XVMC show good agreement, suggesting their reliability in clinical applications.