36 research outputs found

    Finding a Repository with the Help of Machine-Actionable DMPs: Opportunities and Challenges

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    Finding a suitable repository to deposit research data is a difficult task for researchers since the landscape consists of thousands of repositories and automated tool support is limited. Machine-actionable DMPs can improve the situation since they contain relevant context information in a structured and machine-friendly way and therefore enable automated support in repository recommendation. This work describes the current practice of repository selection and the available support today. We outline the opportunities and challenges of using machine-actionable DMPs to improve repository recommendation. By linking the use case of repository recommendation to the ten principles for machine-actionable DMPs, we show how this vision can be realized. A filterable and searchable repository registry that provides rich metadata for each indexed repository record is a key element in the architecture described. At the example of repository registries we show that by mapping machine-actionable DMP content and data policy elements to their filter criteria and querying their APIs a ranked list of repositories can be suggested.  [This paper is a conference pre-print presented at IDCC 2020 after lightweight peer review.

    Metal artifact reduction in 68^{68}Ga-PSMA-11 PET/MRI for prostate cancer patients with hip joint replacement using multiacquisition variable-resonance image combination

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    BACKGROUND PET/MRI has a high potential in oncology imaging, especially for tumor indications where high soft tissue contrast is crucial such as genitourinary tumors. One of the challenges for PET/MRI acquisition is handling of metal implants. In addition to conventional methods, more innovative techniques have been developed to reduce artifacts caused by those implants such as the selective multiacquisition variable-image combination (MAVRIC-SL). The aim of this study is to perform a quantitative and qualitative assessment of metal artifact reduction in 68^{68}Ga-PSMA-11 PET/MRI for prostate cancer patients with hip joint replacement using a selective MAVRIC-SL sequence for the whole pelvis. METHODS We retrospectively analyzed data of 20 men with 37 metal hip implants diagnosed with PCA, staged or restaged by 68^{68}Ga-PSMA-11 PET/MRI from June 2016 to December 2017. Each signal cancellation per side or metal implant was analyzed on the reference sequence LAVA-FLEX, as well as T1-weighted fast spin echo (T1w-FSE) sequence and MAVRIC-SL. Two independent reviewers reported on a four-point scale whether abnormal pelvic 68^{68}Ga-PSMA-11 uptake could be assigned to an anatomical structure in the tested sequences. RESULTS The smallest averaged signal void was observed on MAVRIC-SL sequences with a mean artifact size of 26.17 cm2^{2} (range 12.63 to 42.93 cm2^{2}, p < 0.001). The best image quality regarding anatomical assignment of pathological PSMA uptakes in the pelvis by two independent readers was noted for MAVRIC-SL sequences, followed by T1w-FSE with excellent interreader agreement. CONCLUSIONS MAVRIC-SL sequence allows better image quality in the surrounding of hip implants by reducing MR signal voids and increasing so the accuracy of anatomical assignment of pathological 68^{68}Ga-PSMA-11 uptake in the pelvis over LAVA-FLEX and T1w-FSE sequences

    Estudio sobre lineamientos, incentivos y regulación para el manejo de los Pasivos Ambientales Mineros (PAM), incluyendo cierre de faenas mineras: Bolivia (Estado Plurinacional de), Chile, Colombia y el Perú

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    Las actividades mineras, además de reportar beneficios sociales y económicos, deben internalizar de manera efectiva los impactos ambientales y sociales que generan. Para dar cumplimiento a estos desafíos se considera indispensable proveer de lineamientos sobre los incentivos para la regulación de los Pasivos Ambientales Mineros (PAMs), incluyendo el cierre de faenas mineras. Este informe presenta un análisis detallado de como Bolivia (Estado Plurinacional de), Chile, Colombia y Perú enfrentan su propia realidad en relación a la situación de los PAMs, con la finalidad última de responder a una actualización y compilación de la información ya existente,y de identificar de los desafíos y recomendaciones que estos países se plantean en el camino hacia la mejor gestión de la minería en su territorio.Resumen .-- Introducción .-- I. Contextualización: Estado Plurinacional de Bolivia. Chile. Colombia. Perú .-- II. Base legal. A. Definiciones de Pasivo Ambiental Minero (PAM). B. Legislación sobre Pasivos Ambientales Mineros (PAM). C. Legislación sobre cierre de faenas. D. Legislación ambiental general atingente. E. Regímenes de propiedad-responsabilidad .-- III. Instrumentos de Gestión Integral de Pasivos Ambientales Mineros (PAMs) .-- IV. Conclusiones y recomendaciones
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