1,721,027 research outputs found
Follow-up clinico e neurofunzionale in un gruppo di neonati pretermine con emorragia intraventricolare : outcome a due anni e sensibilità diagnostica delle indagini neuroradiologiche
No full textThis study wants to evaluate in the preterm newborn which kind of cerebral lesion is more linked to a long-term negative outcome and PCI development, and which neuroradiological exam is more sensitive and predictive and therefore better for the follow-up of these patients. Aim and methods 30 preterm newborns divided into two groups, one with IVH and one with IVH and PVL or PEI associated, received a two year follow-up with serial cerebral ultrasound, MRI and Bayley scale. Results The incidence of PCI in the isolated-IVH group was 14,28% while it was 75% in the PVL-PEI associated group; also, Bayley results were lower in the second group too. Conclusions These data suggest that white matter lesions are more linked with PCI than isolated IVH and represents today the most important neonatal disease with long-term negative outcome. The best neuroradiological technique to identify white matter lesions is MRI, while ultrasound is less sensitive and accurate, even thought it’s the most accessible, less expensive tool and so it represent the gold standard for serial screening
Spontaneous improvement of optic pathway lesions in children with neurofibromatosis type 1
No full textTwo cases of spontaneous improvement of optic pathway lesions in neurofibromatosis type 1 are reported. At time of diagnosis the children were aged 21 and 32 months respectively; they have been followed by both MRI and clinical evaluation for 5 and 4 years. MRI findings of the first 19 months of follow-up for Case 1 have been described by us before. On MRI serial evaluation, Case 1 showed an almost complete normalization of the size of lesions and a resolution of enhancement, whereas Case 2 showed a slight decrease in the size of lesions and a resolution of enhancement. From the clinical point of view Case 1 showed a normalization of his clinical signs, whereas in Case 2, a visual improvement was only slight, if at all present. In Case 1, the clinical improvement seemed to follow the spontaneous regression of the lesions detected by MRI
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
Ventriculomegaly
No full textFetal cerebral ventriculomegaly is defined as the enlargement of the lateral ventricles of the developing fetal brain. The term “hydrocephalus” is frequently used as synonym, but it should be limited only to cases with increased pressure of the cerebrospinal fluid (CSF) and usually increased head circumference. Since CSF pressure cannot be measured in the fetal period, the term ventriculomegaly should be preferred. The diagnosis of ventriculomegaly is usually based on reference ranges established by Cardoza et al., in 1988, in which the upper limit of the fetal ventricular measurement does not change during gestation (from 14 to 40 weeks). The incidence of fetal ventriculomegaly ranges from 0.3 to 1.5 per 1000 births according to different series [1]
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
Malformations of the eye and orbit
No full textThe eye forms directly from the embryonic neural tube starting from the fourth week of gestation, under the regulation of several genes and proteins [1]. Malformation of the eye therefore may be isolated, accompany other complex malformations of the nervous system, or may be a part of multisystem developmental abnormalities, due to genetic, environmental, or both genetic and environmental factors. Numerous ocular and orbital anomalies can be recognized and diagnosed on clinical evaluation, but radiologic assessment is often crucial for the differential diagnosis, for the definition of the prognosis and for treatment planning. Moreover, the evaluation of the eye and orbit is a reasonable expectation as part of a detailed fetal US or MRI scan, particularly in the setting of suspected CNS malformations, so that some developmental abnormalities can be recognized also from midgestation onward [2]
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