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Evaluation of Acuros XB Algorithm for Lung SBRT Using Flattening Filter Free

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E Sandrini

E Sandrini1,2*, A da Silva2 , C Silva1 , (1) Clinicas Oncologicas Integradas, Rio De Janeiro, Brazil, (2) Coope- Instituto Alberto Luiz Coimbra de Pos-Graduacao e Pesquisa em Eng, Rio De Janeiro, Brazil,


SU-I-GPD-T-584 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: To evaluate the clinical impact of using the deterministic dose calculation algorithm, Acurus XB (AXB), for lung cancer patients undergoing Stereotactic Body Radiotherapy (SBRT).

Methods: Ninety SBRT treatment plans were set up in the Eclipse TPS using RapidArc planning technique with five different coplanar arcs arrangement encompassing full and semi arcs. For all the treatment plans, 6MV x-ray flattened (6FF), 6MV and 10MV x-ray non-flattened (6FFF and 10FFF) from TrueBeam accelerator equipped with High-Definition 120MLC were used. All plans had a dose delivery schema of 54Gy in 3 fractions. The comparison were done in two steps: first the treatment plans were optimized and calculated by the Anisotropic Analytical Algorithm (AAA) and, then the plans were recalculated using AXB algorithm with identical monitor units and beam arrangements. The conformity index (CI), heterogeneity index (HI), conformity number (CN), maximum, mean, minimum and modal dose of the target were determined for each plan. A paired matched t-test.

Results: The minimum target dose was almost the same for both algorithms. Compared to AAA, a small and significant difference was found for the AXB algorithm, resulting in higher modal and mean target dose (p

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