La morada vital y los historiable en la obra de Américo Castro

UANL

La señora Vital y la señorita Leliebre

UANL

Manifiesto al público que hace el Señor General de división D. Diego Álvarez sobre puntos de vital importancia para la historia de la Revolución del Sur

UANL

L'influence des mesures contenues dans le National Voter Registration Act sur le taux d'enregistrement et le taux de participation aux élections américains de 1980 à 2004

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal

3D registration of MR and X-ray spine images using an articulated model.

Présentation: Cet article a été publié dans le journal : Computerised medical imaging and graphics (CMIG). Le but de cet article est de recaler les vertèbres extraites à partir d’images RM avec des vertèbres extraites à partir d’images RX pour des patients scoliotiques, en tenant compte des déformations non-rigides due au changement de posture entre ces deux modalités. À ces fins, une méthode de recalage à l’aide d’un modèle articulé est proposée. Cette méthode a été comparée avec un recalage rigide en calculant l’erreur sur des points de repère, ainsi qu’en calculant la différence entre l’angle de Cobb avant et après recalage. Une validation additionelle de la méthode de recalage présentée ici se trouve dans l’annexe A. Ce travail servira de première étape dans la fusion des images RM, RX et TP du tronc complet. Donc, cet article vérifie l’hypothèse 1 décrite dans la section 3.2.1.

Multimodal image registration of the scoliotic torso for surgical planning

Background This paper presents a method that registers MRIs acquired in prone position, with surface topography (TP) and X-ray reconstructions acquired in standing position, in order to obtain a 3D representation of a human torso incorporating the external surface, bone structures, and soft tissues. Methods TP and X-ray data are registered using landmarks. Bone structures are used to register each MRI slice using an articulated model, and the soft tissue is confined to the volume delimited by the trunk and bone surfaces using a constrained thin-plate spline. Results The method is tested on 3 pre-surgical patients with scoliosis and shows a significant improvement, qualitatively and using the Dice similarity coefficient, in fitting the MRI into the standing patient model when compared to rigid and articulated model registration. The determinant of the Jacobian of the registration deformation shows higher variations in the deformation in areas closer to the surface of the torso. Conclusions The novel, resulting 3D full torso model can provide a more complete representation of patient geometry to be incorporated in surgical simulators under development that aim at predicting the effect of scoliosis surgery on the external appearance of the patient’s torso.

Articulated Model Registration of MRI/X-Ray Spine Data

This paper presents a method based on articulated models for the registration of spine data extracted from multimodal medical images of patients with scoliosis. With the ultimate aim being the development of a complete geometrical model of the torso of a scoliotic patient, this work presents a method for the registration of vertebral column data using 3D magnetic resonance images (MRI) acquired in prone position and X-ray data acquired in standing position for five patients with scoliosis. The 3D shape of the vertebrae is estimated from both image modalities for each patient, and an articulated model is used in order to calculate intervertebral transformations required in order to align the vertebrae between both postures. Euclidean distances between anatomical landmarks are calculated in order to assess multimodal registration error. Results show a decrease in the Euclidean distance using the proposed method compared to rigid registration and more physically realistic vertebrae deformations compared to thin-plate-spline (TPS) registration thus improving alignment.

El agua : un medio vital escaso

Unidad did??ctica surgida como consecuencia de las pr??cticas realizadas por los grupos de trabajo de profesores sobre el tema del agua, configur??ndose ??ste como un concepto que encierra una gran generalizaci??n y sobre el que existe una creciente problem??tica en la Regi??n de Murcia. En esta unidad se sugieren claramente la metodolog??a a seguir, los supuestos te??ricos en los que se basa, los objetivos y contenidos, as?? como la planificaci??n de la actividad y diversas orientaciones did??cticas y la evaluaci??n. Todo ello est?? acompa??ado de documentos-gu??a para las actividades de los alumnos. Contiene una gran virtualidad para afrontar la mayor parte de los objetivos generales planteados para la etapa de Educaci??n Secundaria Obligatoria.

2D-3D Rigid-Body Registration of X-Ray Fluoroscopy and CT Images

The registration of pre-operative volumetric datasets to intra- operative two-dimensional images provides an improved way of verifying patient position and medical instrument loca- tion. In applications from orthopedics to neurosurgery, it has a great value in maintaining up-to-date information about changes due to intervention. We propose a mutual information- based registration algorithm to establish the proper align- ment. For optimization purposes, we compare the perfor- mance of the non-gradient Powell method and two slightly di erent versions of a stochastic gradient ascent strategy: one using a sparsely sampled histogramming approach and the other Parzen windowing to carry out probability density approximation. Our main contribution lies in adopting the stochastic ap- proximation scheme successfully applied in 3D-3D registra- tion problems to the 2D-3D scenario, which obviates the need for the generation of full DRRs at each iteration of pose op- timization. This facilitates a considerable savings in compu- tation expense. We also introduce a new probability density estimator for image intensities via sparse histogramming, de- rive gradient estimates for the density measures required by the maximization procedure and introduce the framework for a multiresolution strategy to the problem. Registration results are presented on uoroscopy and CT datasets of a plastic pelvis and a real skull, and on a high-resolution CT- derived simulated dataset of a real skull, a plastic skull, a plastic pelvis and a plastic lumbar spine segment.

Compact Representations for Fast Nonrigid Registration of Medical Images

We develop efficient techniques for the non-rigid registration of medical images by using representations that adapt to the anatomy found in such images. Images of anatomical structures typically have uniform intensity interiors and smooth boundaries. We create methods to represent such regions compactly using tetrahedra. Unlike voxel-based representations, tetrahedra can accurately describe the expected smooth surfaces of medical objects. Furthermore, the interior of such objects can be represented using a small number of tetrahedra. Rather than describing a medical object using tens of thousands of voxels, our representations generally contain only a few thousand elements. Tetrahedra facilitate the creation of efficient non-rigid registration algorithms based on finite element methods (FEM). We create a fast, FEM-based method to non-rigidly register segmented anatomical structures from two subjects. Using our compact tetrahedral representations, this method generally requires less than one minute of processing time on a desktop PC. We also create a novel method for the non-rigid registration of gray scale images. To facilitate a fast method, we create a tetrahedral representation of a displacement field that automatically adapts to both the anatomy in an image and to the displacement field. The resulting algorithm has a computational cost that is dominated by the number of nodes in the mesh (about 10,000), rather than the number of voxels in an image (nearly 10,000,000). For many non-rigid registration problems, we can find a transformation from one image to another in five minutes. This speed is important as it allows use of the algorithm during surgery. We apply our algorithms to find correlations between the shape of anatomical structures and the presence of schizophrenia. We show that a study based on our representations outperforms studies based on other representations. We also use the results of our non-rigid registration algorithm as the basis of a segmentation algorithm. That algorithm also outperforms other methods in our tests, producing smoother segmentations and more accurately reproducing manual segmentations.

Les TICs en l'avaluació de les competències en el suport vital avançat

El desenvolupament de les noves tecnologies de la informació i de la comunicació (TIC) obren també un ampli ventall de possibilitats d’innovar en el procés d’ensenyament aprenentatge tot afavorint la semiprencialitat i el treball autònom de l’estudiant. Un altre aspecte a destacar és que permet fer una immersió virtual en un context professional que reprodueix situacions extretes de la realitat que es trobaran en les pràctiques clíniques i en l’activitat professional. En el marc de l’assignatura Infermeria de l’adult: Medicoquirúrgica III que s’imparteix en el darrer curs de la diplomatura d’infermeria té una especial rellevància la formació en suport vital avançat, ja que és una situació que comporta un risc vital per les persones i que requereix gestionar-la amb la màxima eficàcia i efectivitat. La naturalesa d’aquesta formació i els nous recursos de les TICs han propiciat la incorporació d’una aplicació informàtica capaç de formar, entrenar i avaluar els alumnes en aquest àmbit

Matemática vital en el Criet de Calamocha.

Monográfico con título: Educación intercultural

Matemática vital.

Página web del programa matemática vital. Sus objetivos son: mostrar la presencia y la importancia de las matemáticas en la vida diaria; destacar la actualidad de las matemáticas como una ciencia viva e introducir las matemáticas como una fuente de placer intelectual. Se publican actividades, materiales, enlaces, calendario de eventos y otras noticias de interés.

Reputaci??n social y violencia relacional en adolescentes : el rol de la soledad, la autoestima y la satisfacci??n vital

Resumen tomado de la publicaci??n