1,721,093 research outputs found
Esophageal schwannoma mimicking non-functional parathyroid adenoma on 99mTc-sestamibi imaging: a case report
Get PDFTechnetium-99m sestamibi single-photon emission computed tomography/computed tomography (99mTc-sestamibi SPECT/CT) is a mainstay of the pre-operative localization of parathyroid lesions. We report here the case of a 30 year-old woman with a fortuitously discovered 2 cm cervical mass for which a parathyroid origin was originally suspected due to its retro-thyroidal localization and a personal history of nephrolithiasis. Normal serum calcium and parathyroid hormone (PTH) levels excluded primary hyperparathyroidism, raising suspicion of a non-functional parathyroid adenoma, and SPECT/CT imaging showed that the mass was 99mTc-sestamibi-avid. Fine-needle aspiration (FNA) was performed; cytology was non-diagnostic but the needle washout was negative for thyroglobulin, calcitonin and PTH, arguing against a thyroidal or parathyroidal origin of the mass. Core needle biopsy revealed a schwannoma, ostensibly originating from the recurrent laryngeal nerve; upon surgical resection, it was finally found to arise from the esophageal submucosa. This case illustrates the fact that endocrinologists, radiologists, nuclear medicine, head and neck, and other specialists investigating patients with cervical masses should be aware that schwannomas need to be considered in the differential diagnosis of focal 99mTc-sestamibi uptake in the neck region
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Acute spinal MRI. Three years’ experience of a dedicated emergency MRI unit
No full textIntroduction:
ln the last century, conventional radiography, computed tomography and myelography were currently used as first-line investigation for acute spinal injury. Nevertheless, with these modalities, the diagnosis of spinal cord injury was made only indirectly, either by abnormal spinal alignment, relative spinal canal narrowing or presence of bone fragment within the spinal canal. Further characterization of cord lesion with these modalities were and is still poor. Magnetic resonance imaging (MRI) can directly visualize the spinal cord and is nowadays the gold standard to explore spinal cord disease and particularly non traumatic cord lesions. However, due to the worldwide limited access to magnetic resonance imaging in emergency context, indications to perform an urgent spinal magnetic resonance scan are often postponed for hours or days, increasing costs and delays to the patient, and referring physician. The Lausanne University Hospital is the first Hospital in Switzerland with a 3 Tesla magnetic resonance scan in the emergency department, used in daily practice since the 1st of May 2018, this facility optimizes the diagnosis and the management of patients with neurological symptoms or deficits in the emergency department. This retrospective study focuses on its use in the context of spinal injuries with the aim of making an analysis of the pathologies identified as well as the demographic characteristics of these patients and their flow in this emergency context
Material and methods
All patients over 18 years old for which no refusal was documented and who underwent an entire spine magnetic resonance imaging to the emergency department at Lausanne University Hospital between the 1st of January 2018 and the 31st of December 2020 have been enrolled. All these exams are available in the institutional Picture Archiving and Communication System (PACS) of the Lausanne University Hospital. Demographics, clinical and biological data for every patient are available in the institutional patient file (SOARIAN). From the radiological reports, we first differentiated between pathological and non-pathological examinations and each pathological findings were classified in different categories according to the etiology (traumatic, tumoral, inflammatory, infectious, vascular, malformities, degenerative, other). All data were collected on secure Excel spreadsheets for statistical analysis.
Results and discussion
During the first three years of use, 622 whole-spine MRI were performed on a total of 569 patients. In 86.8% of patients, one or more pathological findings, most commonly at the meningeal-disc-vertebral level, were identified. These findings were mostly of degenerative origin. Spinal cord involvement was detected in 19.5% of patients, and in these cases, neoplastic lesions were the most common cause of the injuries. The patient population was composed of 52.5% men and 47.5% women, with a mean age of 60.7 years. These demographic characteristics varied according to the etiologies. These results demonstrate a relatively similar trend to current literature data with some specificities, particularly related to the emergency context of this study
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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