1,720,984 research outputs found
Image-guided interventional procedures in the dog and cat
No full textMedical imaging is essential for the diagnostic workup of many soft tissue and bone lesions in dogs and
cats, but imaging modalities do not always allow the clinician to differentiate inflammatory or infectious
conditions from neoplastic disorders. This review describes interventional procedures in dogs and cats for
collection of samples for cytological or histopathological examinations under imaging guidance. It
describes the indications and procedures for imaging-guided sampling, including ultrasound (US), computed
tomography (CT), magnetic resonance imaging and fluoroscopy. US and CT are currently the
modalities of choice in interventional imaging
Evaluation of a new biopsy device (“spirotome”) for biopsies of the liver, spleen and kidneys: clinical cases
No full text
Contrast-enhanced ultrasonography of the normal canine adrenal gland
No full textContrast-enhanced ultrasonography is useful in differentiating adrenal gland adenomas from nonadenomatous
lesions in human patients. The purposes of this study were to evaluate the feasibility and to describe contrastenhanced
ultrasonography of the normal canine adrenal gland. Six healthy female Beagles were injected with an
intravenous bolus of a lipid-shelled contrast agent (SonoVue
s
). The aorta enhanced immediately followed by the
renal artery and then the adrenal gland. Adrenal gland enhancement was uniform, centrifugal, and rapid from
the medulla to the cortex. When maximum enhancement was reached, a gradual homogeneous decrease in
echogenicity of the adrenal gland began and simultaneously enhancement of the phrenicoabdominal vessels was
observed. While enhancement kept decreasing in the adrenal parenchyma, the renal vein, caudal vena cava, and
phrenicoabdominal vein were characterized by persistent enhancement until the end of the study. A second
contrast enhancement was observed, corresponding to the refilling time. Objective measurements were performed
storing the images for off-line image analysis using Image J (ImageJr). The shape of the time–intensity
curve reflecting adrenal perfusion was similar in all dogs. Ratios of the values of the cortex and the medulla to the
values of the renal artery were characterized by significant differences from initial upslope to the peak allowing
differentiation between the cortex and the medulla for both adrenal glands only in this time period. Contrastenhanced
ultrasonography of the adrenal glands is feasible in dogs and the optimal time for adrenal imaging is
between 5 and 90 s after injection
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
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