1,720,960 research outputs found
[Computerized tomography and magnetic resonance in radical and reconstructive surgery using pedunculated and revascularized flaps in advanced-stage tumors of the head and neck. Analysis of recurrences. II].
No full textJanuary, 1992, to October, 1995, sixty-four patients with advanced head and neck carcinoma were submitted to reconstructive surgery using pedunculated myocutaneous or revascularized flaps and then to CT and MRI. Myocutaneous flaps were used in 26 cases--12 tubular and 14 linear flaps--and revascularized flaps in 38--14 latissimus dorsi flaps, 12 temporal flaps, 7 jejunal flaps and 5 radial flaps. Twenty-six of 64 cases (41%) relapsed: MRI correctly depicted the recurrence in 24 cases and CT in 19, with 2 false positives and 2 false negatives at MRI and 6 false positives and 7 false negatives at CT. The sensitivity, specificity, accuracy, positive and negative predictive value of CT were 84%, 78%, 73%, 76% and 82%, respectively, while the corresponding MR rates were 95%, 94%, 92%, 92% and 95%. MRI was more accurate than CT in demonstrating postoperative and postirradiation changes (92% for MRI versus 73% for CT) thanks to its higher sensitivity in depicting tumor tissue on T2-weighted and post-Gd-DTPA images. CT is very useful in the early postoperative period, to follow-up poorly collaborative patients, because its acquisition time is short; MRI should be performed when CT findings are questionable and the revascularized flap is used to repair a large defect at the skull base
[Computed tomography in the preoperative staging of gastric cancer].
No full textIn gastric cancer patients, CT can demonstrate wall lesions, tumor spread to adjacent organs and metastases. Since the disease is often diagnosed in an advanced stage, some authors used CT to stage the tumor and to avoid surgery in the patients with unresectable lesions. We compared CT staging results with surgical findings in 22 gastric cancer patients. After fluid-filling and hypotonization of the stomach, CT detected gastric wall thickening in all cases. In 4 patients neoplastic nodes 1.5 cm which had been considered as metastatic were negative at histology. Overall CT accuracy in diagnosing nodal involvement was 73\%. The lack of fat plane used as the evidence of direct invasion of adjacent organs exhibited 45\% overall accuracy for hepatic involvement and 82\% accuracy for pancreatic involvement. Seven cases (32\%) were mis-staged by CT: 4 patients (18\%) were under-staged and 3 (14\%) were over-staged. Since it does not always show the real extent of the disease, in the staging of gastric cancer CT is to be considered a complementary tool to surgical staging, even though it is often necessary to choose between radical or palliation surgery
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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