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• W4324132878 abstract "Abstract Purpose Target delineation for radiation therapy is a time‐consuming and complex task. Autocontouring gross tumor volumes (GTVs) has been shown to increase efficiency. However, there is limited literature on post‐operative target delineation, particularly for CT‐based studies. To this end, we trained a CT‐based autocontouring model to contour the post‐operative GTV of pediatric patients with medulloblastoma. Methods One hundred four retrospective pediatric CT scans were used to train a GTV auto‐contouring model. Eighty patients were then preselected for contour visibility, continuity, and location to train an additional model. Each GTV was manually annotated with a visibility score based on the number of slices with a visible GTV (1 = < 25%, 2 = 25–50%, 3 = > 50–75%, and 4 = > 75–100%). Contrast and the contrast‐to‐noise ratio (CNR) were calculated for the GTV contour with respect to a cropped background image. Both models were tested on the original and pre‐selected testing sets. The resulting surface and overlap metrics were calculated comparing the clinical and autocontoured GTVs and the corresponding clinical target volumes (CTVs). Results Eighty patients were pre‐selected to have a continuous GTV within the posterior fossa. Of these, 7, 41, 21, and 11 were visibly scored as 4, 3, 2, and 1, respectively. The contrast and CNR removed an additional 11 and 20 patients from the dataset, respectively. The Dice similarity coefficients (DSC) were 0.61 ± 0.29 and 0.67 ± 0.22 on the models without pre‐selected training data and 0.55 ± 13.01 and 0.83 ± 0.17 on the models with pre‐selected data, respectively. The DSC on the CTV expansions were 0.90 ± 0.13. Conclusion We successfully automatically contoured continuous GTVs within the posterior fossa on scans that had contrast > ± 10 HU. CT‐Based auto‐contouring algorithms have potential to positively impact centers with limited MRI access." @default.
• W4324132878 created "2023-03-15" @default.
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• W4324132878 date "2023-03-14" @default.
• W4324132878 modified "2023-10-14" @default.
• W4324132878 title "Resection cavity auto‐contouring for patients with pediatric medulloblastoma using only CT information" @default.
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• W4324132878 doi "https://doi.org/10.1002/acm2.13956" @default.
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