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- W3120189170 abstract "The use of MRI for radiotherapy planning purposes is growing but image acquisition using radiotherapy set-ups has impaired image quality. Whether differences in image acquisition set-up could modify organ contouring has not been evaluated. Therefore, we aimed to evaluate differences in contouring between paired of image sets that were acquired in the same scanning session using different parameters. Ten patients underwent RT treatment planning with MRI co-registration. MRI was carried out using two different set-ups during the same session, MRI radiotherapy set-ups and MRI diagnostic set-ups. Prostates and rectums were retrospectively contoured in both image sets by 5 radiation oncologists and 4 radiologists. Intra-observer analysis was carried out comparing organ volumes, the Dice coefficient and hausdorff distance values between two contouring rounds. Inter-observer analysis was carried out by comparing individual contours to a generated STAPLE consensus contour, which is considered the gold standard reference. No significant differences were observed between MRI acquisition set-ups. Significant differences were observed for the dice and hausdorff parameters, comparing individual contours to the STAPLE consensus contour, when analysing diagnostic images between rounds, although raw values were similar. Prostate and rectum contours did not differ significantly when using diagnostic or radiotherapy MRI acquisition set-ups. L’utilisation de l’IRM à des fins de planification de la radiothérapie se développe, mais l’acquisition d’images à l’aide de dispositifs de radiothérapie a altéré la qualité des images. Il n’a pas été évalué si des différences dans la configuration de l’acquisition d’images pouvaient modifier le contour des organes. Nous avons donc cherché à évaluer les différences de contours entre des paires d’ensembles d’images acquises au cours d’une même séance de balayage en utilisant des paramètres différents. Dix patients ont été soumis à une planification de traitement par RT avec co-enregistrement IRM. L’IRM a été réalisée en utilisant deux configurations différentes au cours de la même session, à savoir la configuration de radiothérapie et la configuration de diagnostic par IRM. La prostate et le rectum ont été profilés rétrospectivement dans les deux ensembles d’images par cinq radio-oncologues et quatre radiologues. Une analyse intra-observateur a été effectuée pour comparer les volumes des organes, le coefficient de Dice et les valeurs de la distance de Hausdorff entre deux séries de délinéation. L’analyse inter-observateurs a été réalisée en comparant les contours individuels à un contour de consensus STAPLE généré, qui est considéré comme la référence de référence. Aucune différence significative n’a été observée entre les configurations d’acquisition de l’IRM. Des différences significatives ont été observées pour les paramètres de Dice et de Hausdorff, en comparant les contours individuels au contour de consensus STAPLE, lors de l’analyse des images de diagnostic entre les séries, bien que les valeurs brutes soient similaires. Les contours de la prostate et du rectum n’ont pas différé de manière significative lors de l’utilisation de dispositifs d’acquisition d'IRM de diagnostic ou de radiothérapie." @default.
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- W3120189170 date "2021-04-01" @default.
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- W3120189170 title "MRI prostate contouring is not impaired by the use of a radiotherapy image acquisition set-up. An intra- and inter-observer paired comparative analysis with diagnostic set-up images" @default.
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- W3120189170 doi "https://doi.org/10.1016/j.canrad.2020.05.024" @default.
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