Use of a second-dose calculation algorithm to check dosimetric parameters for the dose distribution of a first-dose calculation algorithm for lung SBRT plans |
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| Institution: | 1. Division of Clinical Radiology Service, Kyoto University Hospital, Kyoto 606-8507, Japan;2. Department of Radiation Oncology and Image-applied Therapy, Kyoto University Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan;2. Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan;3. Graduate School of Health Sciences, Kumamoto University, Kumamoto, Japan;1. Medical Physics Department, A.S.L. TO4, 10015 Ivrea (TO), Italy;2. Radiotherapy Department, A.S.L. TO4, 10015 Ivrea (TO), Italy;1. Division of Medical Physics, CancerCare Manitoba, Winnipeg R3E 0V9, Canada;2. Department of Physics and Astronomy, University of Manitoba, Winnipeg R3M 2N2, Canada;3. Department of Radiology, University of Manitoba, Winnipeg R3M 2N2, Canada;1. Humanitas Research Hospital and Cancer Center, Radiotherapy and Radiosurgery Dept, via Manzoni 56, 20089 Milan-Rozzano, Italy;2. Humanitas University, Biomedical Science Faculty, via Manzoni 118, 20089 Milan-Rozzano, Italy;1. Division of Clinical Radiology Service, Kyoto University Hospital, Kyoto 606-8507, Japan;2. Division of Medical Physics, Department of Information Technology and Medical Engineering, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan;3. Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan |
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| Abstract: | PurposeTo verify lung stereotactic body radiotherapy (SBRT) plans using a secondary treatment planning system (TPS) as an independent method of verification and to define tolerance levels (TLs) in lung SBRT between the primary and secondary TPSs.MethodsA total of 147 lung SBRT plans calculated using X-ray voxel Monte Carlo (XVMC) were exported from iPlan to Eclipse in DICOM format. Dose distributions were recalculated using the Acuros XB (AXB) and the anisotropic analytical algorithm (AAA), while maintaining monitor units (MUs) and the beam arrangement. Dose to isocenter and dose-volumetric parameters, such as D2, D50, D95 and D98, were evaluated for each patient. The TLs of all parameters between XVMC and AXB (TLAXB) and between XVMC and AAA (TLAAA) were calculated as the mean ± 1.96 standard deviations.ResultsAXB values agreed with XVMC values within 3.5% for all dosimetric parameters in all patients. By contrast, AAA sometimes calculated a 10% higher dose in PTV D95 and D98 than XVMC. The TLAXB and TLAAA of the dose to isocenter were −0.3 ± 1.4% and 0.6 ± 2.9%, respectively. Those of D95 were 1.3 ± 1.8% and 1.7 ± 3.6%, respectively.ConclusionsThis study quantitatively demonstrated that the dosimetric performance of AXB is almost equal to that of XVMC, compared with that of AAA. Therefore, AXB is a more appropriate algorithm for an independent verification method for XVMC. |
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| Keywords: | Monitor unit verification Dose calculation algorithm Independent secondary TPS Lung SBRT |
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