Simulation of the Linear Boltzmann Transport Equation in Modelling Of Photon Beam Data

Akpochafor, Michael Onoriode; Aweda, Moses Adebayo; F.A., Durosinmi-Etti; S.O., Adeneye; AD., Omojola

doi:10.9790/4861-0567286

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…The collapse cone algorithm used by RayStation and AAA are both categorized as Type B algorithms, which account for heterogeneities [21] [22]. In contrast, Acuros XB, a more advanced Type C algorithm, explicitly solves the linear Boltzmann equation to yield results with Monte Carlo-like precision [23] [24]. The lung tissue is less dense than surrounding tissues, which can significantly affect radiation delivery and dose distributation around tumors.…”

Section: Introductionmentioning

confidence: 99%

Dosimetric Evaluation and Comparison of Collapsed Cone Algorithm with AAA and AcurosXB Algorithms for Lung Cancer Treatment Planning on the Varian Halcyon Accelerator

Shao,

Du,

Qiu

et al. 2023

Preprint

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Objective: This study aims to compare the dosimetric calculationsin standard non-small cell lung cancer (NSCLC) radiotherapy planningusing the Collapsed Cone (CC) algorithm of the RayStation planningsystem on the Varian Halcyon accelerator, with the Analytical AnisotropicAlgorithm (AAA) and Acuros XB algorithms on the Eclipse accelerator. Methods: The RayStation planning system was employed to designthe RapidArc radiotherapy plans for 15 lung cancer patients on theHalcyon accelerator, using the CC algorithm for dose calculation.The plans were then transferred to the Eclipse planning system. Withoutmaking any changes to these plans, doses were computed using bothAAA and Acuros XB algorithms. The differences in dose-volume indicesfor the clinical target volume (CTV), planned target volume (PTV),and other organs at risk were evaluated. Results:Compared with the CC algorithm, the AAA algorithmshowed slightly lower dose-volume indices for both the CTV (D2%,D50%, D95%, D98%, and mean dose) and the PTV (D2%, D50%, andmean dose), with differences within 1%. Specifically, the PTV's D95%and D98% were respectively 1.7% and 2.4% lower, the heart's meandose was 3.2% lower, the lung's V20Gy was 0.2% lower, the averagedose was 0.2% higher, and the spinal cord's maximum dose (representedby D0.1cc) was 0.9% lower. In contrast to the CC algorithm, the AcurosXB algorithm also showed slightly lower dose-volume indices for theCTV and the PTV, with differences within 1.5%. Specifically, thePTV's D95% and D98% were respectively 1.6% and 2.3% lower, theheart's mean dose was 4.4% lower, the lung's V20Gy was 0.3% lower,the average dose was 1.4% lower, and the spinal cord's maximum dosewas 2.3% lower. Paired t-tests indicated that all these results hadsignificant differences (p<0.05). Conclusion: This study aimed to quantify the impact of usingRayStation system and CC algorithm on Halcyon accelerator for clinicaldose evaluations, by comparing it with the AAA and Acuros XB algorithmsof the Varian Eclipse planning system. For lung cancer radiotherapyplanning, dose calculations obtained from the AAA and Acuros XB algorithmsunder the Eclipse system were slightly lower compared to the RayStationCC algorithm across various clinical indices. Notably, the differencesin the PTV's D95% and D98% indices were over 1.5%, while dose indicesfor various organs at risk were approximately 2∼3% lower. The results of this study can serve as a reference for institutionsthat are preparing to use the RayStation planning system for the designand clinical application of plans on the Varian Halcyon accelerator.

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Section: Introductionmentioning

confidence: 99%

Dosimetric Evaluation and Comparison of Collapsed Cone Algorithm with AAA and AcurosXB Algorithms for Lung Cancer Treatment Planning on the Varian Halcyon Accelerator

Shao,

Du,

Qiu

et al. 2023

Preprint

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Calculation of absorbed dose in radiotherapy by solution of the linear Boltzmann transport equations

Bedford

2019

Phys. Med. Biol.

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Over the last decade, dose calculations which solve the linear Boltzmann transport equations have been introduced into clinical practice and are now in widespread use. However, knowledge in the radiotherapy community concerning the details of their function is limited. This review gives a general description of the linear Boltzmann transport equations as applied to calculation of absorbed dose in clinical radiotherapy. The aim is to elucidate the principles of the method, rather than to describe a particular implementation. The literature on the performance of typical algorithms is then reviewed, in many cases with reference to Monte Carlo simulations. The review is completed with an overview of the emerging applications in the important area of MR-guided radiotherapy.

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Dosimetric Comparison between Varian Halcyon Analytical Anisotropic Algorithm and Acuros XB Algorithm for Planning of RapidArc Radiotherapy of Cervical Carcinoma

Mbewe

Shiba

2021

Progress in Medical Physics

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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, P=0.129; 44.87 Gy vs. 44.70 Gy, P=0.089; 46.00 Gy vs. 45.98 Gy, P=0.154; and 0.51 vs. 0.50, P=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, P=0.902; 47.34 Gy vs. 47.75 Gy, P<0.001; 48.62 Gy vs. 50.14 Gy, P<0.001; and 0.06 vs. 0.07, P=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 (P>0.05).

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Simulation of the Linear Boltzmann Transport Equation in Modelling Of Photon Beam Data

Abstract: A beam data modelling algorithm was developed by solving the linear Boltzmann Transport Equation (BTE). The Linear Boltzmann Transport Equation (LBTE) is a form of the

Cited by 3 publications

References 9 publications

Dosimetric Evaluation and Comparison of Collapsed Cone Algorithm with AAA and AcurosXB Algorithms for Lung Cancer Treatment Planning on the Varian Halcyon Accelerator

Dosimetric Evaluation and Comparison of Collapsed Cone Algorithm with AAA and AcurosXB Algorithms for Lung Cancer Treatment Planning on the Varian Halcyon Accelerator

Calculation of absorbed dose in radiotherapy by solution of the linear Boltzmann transport equations

Dosimetric Comparison between Varian Halcyon Analytical Anisotropic Algorithm and Acuros XB Algorithm for Planning of RapidArc Radiotherapy of Cervical Carcinoma

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