1,720,963 research outputs found
CT reconstructions and 3D surface models of preserved impressions found on a Rijksmuseum terracotta sculpture
No full textThis dataset contains 3D micro Computed Tomography (CT) reconstructions (*.tiff files) and 3D surface models (Wavefront OBJ files) of preserved impressions found on the terracotta sculpture "Study for a Hovering Putto", dated between 1735 and 1750, and attributed to Laurent Delvaux (Gent, 17 January 1696 – Nivelles, 24 February 1778, Rijksmuseum, BK-NM-9352). The preserved impressions are fingermarks and toolmarks, which we analyse in the manuscript "Artist profiling using micro-CT scanning of a Rijksmuseum terracotta sculpture" by Sero et al.
Folder names correspond to the names assigned to each impression in the manuscript. Each folder contains a stack of *.tiff files and a "Segmentation.obj", which is the 3D model obtained from Otsu's segmentation method in Slicer3D. The stack of *tiff files and the 3D models can be visualized together in Slicer3D.The stack of *tiff files and the 3D models can be visualized together in Slicer3D. The 3D models can be also visualized in MeshLab.Funding provided by: Nederlandse Organisatie voor Wetenschappelijk OnderzoekCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100003246Award Number: 628.007.033Funding provided by: Nederlandse Organisatie voor Wetenschappelijk OnderzoekCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100003246Award Number: 639.073.506Funding provided by: Rijksmuseum*Crossref Funder Registry ID: Award Number:We acquired the projection images at the FleX-ray Lab (Centrum Wiskunde & Informatica), and we performed the 3D reconstructions in the same facility. We implemented 3D CT reconstructions in Python version v3.6, ASTRA v2.1.0, FleXbox v1.0.0.
We convert each grayscale intensity image into a binary image using Otsu's segmentation method, which finds the threshold that minimizes the intra-class variance of the thresholded black and white pixels. We then convert the grayscale image into a binary one according to the computed threshold. We then load the stack of binary images in Slicer3D, where the triangular surface mesh is generated, and we export to model file (Wavefront OBJ format)
Characterization of the lymph nodes in nasopharyngeal carcinoma through registered magnetic resonance images
No full textLAUREA MAGISTRALEL'imaging tomografico ha rivoluzionato l'efficacia del trattamento del Carcinoma Rinofaringeo (NPC), e ha consentito di visualizzare il grado di estensione del tumore principale con una precisione senza precedenti. La sua accuratezza consente uno sviluppo e una gestione migliori del trattamento radioterapico, perfezionando i risultati del trattamento stesso. Attualmente, l'imaging PET è ritenuto più sensibile rispetto all'imaging in MR nell'individuazione di carcinomi rinofaringei residui e persistenti. Nonostante ciò, l'imaging in MR è adatto per la visualizzazione del tessuto molle nasofaringeo superficiale e profondo, ed è in grado di differenziare il tumore dal tessuto molle stesso. Inoltre, l'imaging pesato in diffusione (DWI) consente di valutare la diffusione delle molecole d'acqua in relazione ai tessuti patologici. Nel seguente lavoro di tesi è stato sviluppato un metodo di caratterizzazione dei linfonodi patologici in pazienti affetti da NPC basandosi sullo stesso set di immagini in MRI e DWI usato dai radiologici per stabilire le zone tumorali. Le immagini del dataset sono state registrate su un'immagine di riferimento per ottenere dei volumi finali ricampionati, con una risoluzione isotropica orientata nel sistema di coordinate del paziente. Il punto di partenza della procedura di caratterizzazione è stato la creazione di una funzione di appartenenza della nell'immagine b-1000 di pre trattamento. La funzione è stata poi applicata all'immagine b-1000 di post trattamento e il risultato è una mappa di probabilità usata per condurre il test statistico di Wilcoxon Somma dei Ranghi sulle mappe di multi ADC. La mappa di identificazione finale ottenuta è stata confrontata con i linfonodi segmentati da un radiologo sull'immagine pesata in diffusione b-1000. La tecnica è semi automatica dal momento che l'aiuto di un radiologo esperto è necessaria. I volumi finali definiscono mappe di identificazione che potrebbero essere degli strumenti utili per una migliore valutazione del tessuto affetto da NPC.
La tecnica implementata è semi-automatica dal momento che l'aiuto di un radiologo esperto è necessario. I volumi risultanti definiscono mappe di identificazione dei tessuti che possono essere considerate dei validi strumenti per valutare meglio i tessuti affetti da NPC.Cross-sectional imaging has revolutionised the effectiveness of treatment for Nasopharyngeal Carcinoma (NPC). Cross-sectional imaging displays the extent of the primary tumour with unprecedented precision. This accuracy enables radiotherapy treatment to be designed and administered more accurately, effectively improving the outcomes for this form of treatment. Nowadays, PET has been reported to be more sensitive than MRI at detecting residual and recurrent nasopharyngeal carcinoma. However, MRI is suitable in displaying both superficial and deep nasopharyngeal soft tissue, and for differentiating tumour from soft tissue. Moreover, Diffusion Weighted Imaging evaluates the water diffusion related to pathological tissues. The current study developed a characterization method to identify pathological lymph nodes in patients affected by NPC on the same MRI and DWI dataset used by the radiologist to evaluate the tumoral area. The dataset, composed by an anatomical T VIBE enhanced with Gadolinium image and DWI series, underwent a previous registration procedure in order to have resampled and isotropic resolution volumes oriented in a patient-based coordinate system. The characterization procedure started with the creation of a membership fuction of the in a pre treatment b-1000 examination, which was then applied to the post treatment b-1000 image. The result was a probability map whose voxels' intensities indicated the probability of \textit{belonging} to a lymph node. The map was used to perform the statistic Wilcoxon Rank Sum Test on the multi ADC maps. The final identification map obtained was then compared to the lymph nodes segmented on the post treatment b-1000 DW image segmented by a radiologist. The technique is semi-automated since the help of an experienced radiologist is necessary. The resulting volumes define tissue identification maps which could be useful tools for a better NPC tissue evaluation
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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