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• W2894524116 abstract "<h3>Purpose</h3> Both midposition (MidP) and internal target volume (ITV) strategies can take the respiration-induced target motion into account. This study aimed to compare these 2 strategies in terms of clinical target volume (CTV) coverage and dose to organs at risk (OARs) for esophageal cancer radiation therapy (RT). <h3>Methods and Materials</h3> Fifteen patients with esophageal cancer were included retrospectively for neoadjuvant RT planning. Per patient, a 10-phase, 4-dimensional (4D) computed tomography (CT) scan (4D-CT) was acquired with CTV and OARs delineated on the 20% phase. The MidP-CT scan was reconstructed based on deformable image registration between the 20% phase and the other 9 phases; thereby, the CTV and OARs delineations were propagated and an ITV was constructed. Both MidP and ITV strategies were used for treatment planning, yielding the planned dose. Next, these plans were applied to the 10-phase 4D-CT to calculate the dose distribution for each phase of the 4D-CT. On the basis of the deformable image registration, these calculated dose distributions were warped and averaged to yield the accumulated 4D dose. Subsequently, we compared, in terms of CTV coverage and dose to OARs, the planned dose with the accumulated 4D dose and the MidP strategy with the ITV strategy. <h3>Results</h3> The differences between the planned dose and the accumulated 4D dose were limited and clinically irrelevant. In 14 patients, both MidP and ITV strategies showed V_95% > 98% for the CTV. Compared with the ITV strategy, the MidP strategy showed a significant reduction of approximately 10% in the dose-volume histogram parameters for the lungs, heart, and liver (<i>P</i> < .001, Wilcoxon signed-rank test). <h3>Conclusions</h3> Compared with the ITV strategy, the MidP strategy in treatment planning can lead to a reduction of approximately 10% in the dose to OARs, with an adequate CTV coverage for esophageal cancer RT." @default.
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• W2894524116 date "2019-02-01" @default.
• W2894524116 modified "2023-09-24" @default.
• W2894524116 title "Dosimetric Benefits of Midposition Compared With Internal Target Volume Strategy for Esophageal Cancer Radiation Therapy" @default.
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• W2894524116 doi "https://doi.org/10.1016/j.ijrobp.2018.09.024" @default.
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