1,721,023 research outputs found
Ultrasound-guided mammotome vacuum biopsy for the diagnosis of impalpable breast lesions
No full textUltrasound Obstet Gynecol. 2001 Nov;18(5):520-4.
Ultrasound-guided mammotome vacuum biopsy for the diagnosis of impalpable breast lesions.
Meloni GB, Dessole S, Becchere MP, Soro D, Capobianco G, Ambrosini G, Nardelli GB, Canalis GC.
SourceInstitute of Radiology, Italy.
Abstract
OBJECTIVES: To assess the diagnostic accuracy of ultrasound-guided mammotome vacuum biopsy in impalpable breast lesions.
METHODS: Seventy-three patients who presented with impalpable breast lesions that were suspicious for malignancy at mammography and/or sonography were included in the study. In the first instance the women underwent ultrasound-guided fine-needle aspiration cytology, then, 3 days later, histological biopsy with an ultrasound-guided mammotome device. The patients with both cytological and histological diagnoses of malignancy underwent surgery; those with a negative (for malignancy) cytological diagnosis, but with a histological diagnosis of atypical hyperplasia or sclerosing adenosis, underwent surgical biopsy.
RESULTS: The diagnostic accuracy of fine-needle aspiration cytology was 67.2%; the sensitivity was 86.7%, the specificity was 48.4%, the negative predictive value was 78.9% and the positive predictive value was 61.9%. In comparison, the diagnostic accuracy of histological sampling by mammotome vacuum biopsy was 97.3%; the sensitivity was 94.7%, the specificity was 100%, the negative predictive value was 94.6% and the positive predictive value was 100%. Thus there was a statistically significant difference in diagnostic accuracy between fine-needle aspiration cytology and mammotome vacuum biopsy (67.2% vs. 97.3%; chi2 test, P < 0.001). The 2.7% (2/73) failure rate of mammotome biopsy was likely to be due to an error in the positioning of the needle. The subsequent surgical biopsy proved that two cases, negative for malignancy by mammotome biopsy, were in fact malignant.
CONCLUSIONS: Our data confirm the value of sonography for the diagnosis of breast carcinoma in the preclinical phase and the efficacy of ultrasound sampling using a mammotome device to confirm the diagnosis in impalpable breast lesions
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
Diabetic myonecrosis: imaging findings illustration and literature review
No full textWe illustrate the imaging findings of Diabetes Muscle Infarction (DMI), a rare complication of
longlasting and poorly controlled Diabetes Mellitu
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
- …
