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논문 기본 정보

자료유형
학술저널
저자정보
Jonathan Mbewe (Groote Schuur Hospital) Sakhele Shiba (Groote Schuur Hospital)
저널정보
한국의학물리학회 의학물리 의학물리 제32권 제4호
발행연도
2021.12
수록면
130 - 136 (7page)
DOI
10.14316/pmp.2021.32.4.130

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Purpose: The Halcyon radiotherapy platform at Groote Schuur Hospital was delivered with a factory-configured analytical anisotropic algorithm (AAA) beam model for dose calculation. In a recent system upgrade, the Acuros XB (AXB) algorithm was installed. Both algorithms adopt fundamentally different approaches to dose calculation. This study aimed to compare the dose distributions of cervical carcinoma RapidArc plans calculated using both algorithms. Methods: A total of 15 plans previously calculated using the AAA were retrieved and recalculated using the AXB algorithm. Comparisons were performed using the planning target volume (PTV) maximum (max) and minimum (min) doses, D95%, D98%, D50%, D2%, homogeneity index (HI), and conformity index (CI). The mean and max doses and D2% were compared for the bladder, bowel, and femoral heads. Results: The AAA calculated slightly higher targets, D98%, D95%, D50%, and CI, than the AXB algorithm (44.49 Gy vs. 44.32 Gy, =0.129; 44.87 Gy vs. 44.70 Gy, =0.089; 46.00 Gy vs. 45.98 Gy, =0.154; and 0.51 vs. 0.50, =0.200, respectively). For target min dose, D2%, max dose, and HI, the AAA scored lower than the AXB algorithm (41.24 Gy vs. 41.30 Gy, =0.902; 47.34 Gy vs. 47.75 Gy, <0.001; 48.62 Gy vs. 50.14 Gy, <0.001; and 0.06 vs. 0.07, =0.002, respectively). For bladder, bowel, and left and right femurs, the AAA calculated higher mean and max doses. Conclusions: Statistically significant differences were observed for PTV D2%, max dose, HI, and bowel max dose ( >0.05).

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