A comparison between magnetic resonance angiography at 3 teslas (time-of-flight and contrast-enhanced) and flat-panel digital subtraction angiography in the assessment of embolized brain aneurysms

PURPOSE: To compare the time-of-flight and contrast-enhanced- magnetic resonance angiography techniques in a 3 Tesla magnetic resonance unit with digital subtraction angiography with the latest flat-panel technology and 3D reconstruction in the evaluation of embolized cerebral aneurysms. INTRODUCTION: Many embolized aneurysms are subject to a recurrence of intra-aneurismal filling. Traditionally, imaging surveillance of coiled aneurysms has consisted of repeated digital subtraction angiography. However, this method has a small but significant risk of neurological complications, and many authors have advocated the use of noninvasive imaging methods for the surveillance of embolized aneurysms. METHODS: Forty-three aneurysms in 30 patients were studied consecutively between November 2009 and May 2010. Two interventional neuroradiologists rated the time-of-flight-magnetic resonance angiography, the contrast-enhanced-magnetic resonance angiography, and finally the digital subtraction angiography, first independently and then in consensus. The status of aneurysm occlusion was assessed according to the Raymond scale, which indicates the level of recanalization according to degrees: Class 1: excluded aneurysm; Class 2: persistence of a residual neck; Class 3: persistence of a residual aneurysm. The agreement among the analyses was assessed by applying the Kappa statistic. RESULTS: Inter-observer agreement was excellent for both methods (K = 0.93; 95 % CI: 0.84-1). Inter-technical agreement was almost perfect between time-of-flight-magnetic resonance angiography and digital subtraction angiography (K = 0.98; 95 % CI: 0.93-1) and between time-of-flight-magnetic resonance angiography and contrast-enhanced-magnetic resonance angiography (K = 0.98; 95% CI: 0.93-1). Disagreement occurred in only one case (2.3%), which was classified as Class I by time-of-flight-magnetic resonance angiography and Class II by digital subtraction angiography. The agreement between contrast-enhanced-magnetic resonance angiography and digital subtraction angiography was perfect (K = 1; 95% CI: 1-1). In three patients, in-stent stenosis was identified by magnetic resonance angiography but not confirmed by digital subtraction angiography. CONCLUSION: Digital subtraction angiography and both 3T magnetic resonance angiography techniques have excellent reproducibility for the assessment of aneurysms embolized exclusively with coils. In those cases also treated with stent remodeling, digital subtraction angiography may still be necessary to confirm eventual parent artery stenosis, as identified by magnetic resonance angiography

Imagens de Maria e Madalena: corpos em busca de purificação e absolvição no presente

This article presents an analysis, with the aid of the Cultural Studies and of Gender, of Maria's artistic representations and Maria Madalena and of their speeches on the feminine body prescribed and contemplated by these images in the practices and in the women's bodies that frequent the Metropolitan Cathedral of Florianópolis, where these works are present. Looking for to evidence, with the aid of the image reading and of interviews done with this group of women, their reception forms, who are these women, their identities, desires, experiences with the sexuality, virginity, belonging to a history of the imaginary feminine of the present time. Attributing, like this, history to their attitudes, faiths, rituals, behaviors, conflicts, that they travel for relationships of power, gender, class, religion.Este artigo apresenta uma análise, com o auxílio dos Estudos Culturais e de Gênero, das representações artísticas de Maria e Maria Madalena e de seus discursos sobre o corpo feminino prescritos e refletidos por estas imagens nas práticas e nos corpos de um grupo de mulheres que freqüentam a Catedral Metropolitana de Florianópolis, onde estas obras estão presentes. Buscando evidenciar, com o auxílio da leitura de imagem e de entrevistas feitas com este grupo de mulheres, as suas formas de recepção, revelando quem são estas mulheres, suas identidades, desejos, experiências com a sexualidade, virgindade, pertencentes a uma história do imaginário feminino do tempo presente. Atribuindo, assim, historicidade às suas atitudes, crenças, rituais, comportamentos, conflitos, que perpassam por relações de poder, gênero, classe, religiã

A função do secretário escolar na contemporaneidade: entre memórias e arquivos escolares

Este artigo tem o intuito de refletir de forma crítica sobre a função do secretário escolar na escola, mediante as modificações pedagógicas, culturais e identitárias da contemporaneidade. Discute também, acerca da importância dos arquivos administrativos da escola como fonte documental para revelar memórias e histórias de vida da comunidade escolar e de seu entorno. Observar o interior da escola é uma tarefa complexa, mas fundamental para elaboração de um diagnóstico qualitativo e quantitativo para uma avaliação sistemática das características, expectativas, possibilidades e limitações existentes na instituição, para novos desafios e percursos

A função do secretário escolar na contemporaneidade: entre memórias e arquivos escolares

Este artigo tem o intuito de refletir de forma crítica sobre a função do secretário escolar na escola, mediante as modificações pedagógicas, culturais e identitárias da contemporaneidade. Discute também, acerca da importância dos arquivos administrativos da escola como fonte documental para revelar memórias e histórias de vida da comunidade escolar e de seu entorno. Observar o interior da escola é uma tarefa complexa, mas fundamental para elaboração de um diagnóstico qualitativo e quantitativo para uma avaliação sistemática das características, expectativas, possibilidades e limitações existentes na instituição, para novos desafios e percursos

Caracterização da variabilidade intraespecífica do patótipo 65 de Colletotrichum lindemuthianum.

O objetivo deste trabalho foi avaliar a reação diferencial entre feijoeiro comum e diferentes isolados do patótipo 65

Idade, peso e prenhez de novilhas Nelore mocha.

Objetivou-se com este trabalho caracterizar idade, peso e prenhez em novilhas Nelore. Utilizou-se 56 novilhas da raça Nelore, desafiadas com touros para a determinação da idade a primeira prenhez. As novilhas foram pesadas a cada dois meses dos 16 aos 32 meses de idade. Os resultados evidenciaram idade média de 24,10 ± 5,13 meses e peso médio de 304,83 ± 48,23 kg nas 37 novilhas prenhas. Concluiu-se que a idade a primeira prenhez das novilhas Nelore observada neste experimento encontra-se próxima ao descrito na literatura para fêmeas zebuínas, havendo a necessidade de maiores estudos, relacionados ao melhoramento genético e/ou alternativas de manejo, a fim de antecipar a ocorrência da primeira prenhez

W-algebras from symplectomorphisms

It is shown how $W$-algebras emerge from very peculiar canonical transformations with respect to the canonical symplectic structure on a compact Riemann surface. The action of smooth diffeomorphisms of the cotangent bundle on suitable generating functions is written in the BRS framework while a $W$-symmetry is exhibited. Subsequently, the complex structure of the symmetry spaces is studied and the related BRS properties are discussed. The specific example of the so-called $W_3$-algebra is treated in relation to some other different approaches.Comment: LaTex, 25 pages, no figures, to appear in Journ. Math. Phy

Discovery limits for a new contact interaction at future hadronic colliders with polarized beams

The production of high-transverse energy jets in hadron-hadroncollisions is sensitive to the presence of new contact interactions between quarks. If proton polarization were available, the measurement of some parity violating spin asymmetries in one-jet production at large transverse energy would complement the usual search for deviations from the expected QCD cross section. In the same time, a unique information on the chirality structure of the new interaction could be obtained. In this context, we compare the potentialities of various $pp$ and $p\bar p$ colliders that are planned or have been proposed, with the additional requirement of beam polarization.Comment: Latex file, 9 pages and 1 ps fig, definition of the subprocess variables and one example of the effect of new contact terms on the parity violating spin asymmetry are added. Eq. 8 (now eq. 9) and the following equation are changed, giving better bounds in the polarized pp case (new figure

Variabilidade de Colletotrichum lindemuthianum em alguns estados brasileiros.

O objetivo deste trabalho foi realizar um estudo da distribuição de coletas, e conseqüentemente um levantamento da freqüência de patótipos/raças de C. lindemuthianum provenientes de cultivos de feijoeiro comum em vários estados brasileiros

A Predictive Minimal Model for Neutrino Masses and Mixings

A model is considered in which the scale of the heavy singlet neutrinos is a few orders of magnitude below the grand unification scale and where right-handed vector bosons play still a negligible role. In a basis with diagonal up-quark and Dirac-neutrino mass matrices it is assumed that the heavy neutrino mass matrix has only zero elements in its diagonal, in analogy to the light neutrino mass matrix in the Zee model. Connecting then the remaining matrix elements with the small parameter describing the hierarchy of quark masses and mixings and by assuming commutativity of the charged lepton with the down-quark mass matrix, the calculation of all neutrino properties can be performed in terms of the two mass differences relevant for atmospheric and solar neutrino oscillations. CP-violation is directly related to CP-violation in the quark sector.Comment: revtex, 9 pages, two references added, to be published in Phys. Rev. D presented at Neutrino' 2000, Sudbury, Canad