Matematinio modelio sukūrimas ir taikymas krūtinės ląstos kompiuterinės tomografijos vaizdams parametrizuoti ir registruoti

The scope of this work is analysis methods of computed tomography images. Many diseases may be diagnosed and their treatment observed using the computed tomography (CT). CT scans are 3D images, i.e. a collection of 2D images (slices), representing human body cross-section with a transversal plane. When evaluating the efficiency of treatment or progress of the disease, pre- and post-treatment CT scans must be made (for the same patient). That aims to observe the changes inside the human body without cutting and to choose the strategy for treatment. A very common tomography object is the breast area, – this area is particularly important because many important internal organs are located here: liver, heart, stomach, pancreas, lungs, etc. It is mostly protected by the rib cage. Then radiologists sometimes need to find a position of a single slice of one computed tomography (CT) scan in another scan. The search must be independent of a patient position with respect to bed and the radiocontrast agent injection. The registration problem could be solved by using the metadata of the DICOM header of a CT scan. However, the available information is often error-prone. The aim of this work is to reveal a possibility to register a computed tomography slices by the fragments of the rib bone in the slice

Discutindo a educação ambiental no cotidiano escolar: desenvolvimento de projetos na escola formação inicial e continuada de professores

A presente pesquisa buscou discutir como a Educação Ambiental (EA) vem sendo trabalhada, no Ensino Fundamental e como os docentes desta escola compreendem e vem inserindo a EA no cotidiano escolar., em uma escola estadual do município de Tangará da Serra/MT, Brasil. Para tanto, realizou-se entrevistas com os professores que fazem parte de um projeto interdisciplinar de EA na escola pesquisada. Verificou-se que o projeto da escola não vem conseguindo alcançar os objetivos propostos por: desconhecimento do mesmo, pelos professores; formação deficiente dos professores, não entendimento da EA como processo de ensino-aprendizagem, falta de recursos didáticos, planejamento inadequado das atividades. A partir dessa constatação, procurou-se debater a impossibilidade de tratar do tema fora do trabalho interdisciplinar, bem como, e principalmente, a importância de um estudo mais aprofundado de EA, vinculando teoria e prática, tanto na formação docente, como em projetos escolares, a fim de fugir do tradicional vínculo “EA e ecologia, lixo e horta”.Facultad de Humanidades y Ciencias de la Educació

Development and application of a mathematical model to parametrization and registration of breast area computed tomography

The scope of this work is analysis methods of computed tomography images. Many diseases may be diagnosed and their treatment observed using the computed tomography (CT). CT scans are 3D images, i.e. a collection of 2D images (slices), representing human body cross-section with a transversal plane. When evaluating the efficiency of treatment or progress of the disease, pre- and post-treatment CT scans must be made (for the same patient). That aims to observe the changes inside the human body without cutting and to choose the strategy for treatment. A very common tomography object is the breast area, – this area is particularly important because many important internal organs are located here: liver, heart, stomach, pancreas, lungs, etc. It is mostly protected by the rib cage. Then radiologists sometimes need to find a position of a single slice of one computed tomography (CT) scan in another scan. The search must be independent of a patient position with respect to bed and the radiocontrast agent injection. The registration problem could be solved by using the metadata of the DICOM header of a CT scan. However, the available information is often error-prone. The aim of this work is to reveal a possibility to register a computed tomography slices by the fragments of the rib bone in the slice

Speeding-up the fitting of the model defining the ribs-bounded contour

The method for analysing transversal plane images from computer tomography scans is considered in the paper. This method allows not only approximating ribs-bounded contour but also evaluating patient rotation around the vertical axis during a scan. In this method, a mathematical model describing the ribs-bounded contour was created and the problem of approximation has been solved by finding the optimal parameters of the mathematical model using least-squares-type objective function. The local search has been per-formed using local descent by quasi-Newton methods. The benefits of analytical derivatives of the function are disclosed in the paper

Search for narrow resonances using the dijet mass spectrum in pp collisions at s√=8 TeV

Results are presented of a search for the production of new particles decaying to pairs of partons (quarks, antiquarks, or gluons), in the dijet mass spectrum in proton-proton collisions at s√=8  TeV. The data sample corresponds to an integrated luminosity of 4.0  fb−1, collected with the CMS detector at the LHC in 2012. No significant evidence for narrow resonance production is observed. Upper limits are set at the 95% confidence level on the production cross section of hypothetical new particles decaying to quark-quark, quark-gluon, or gluon-gluon final states. These limits are then translated into lower limits on the masses of new resonances in specific scenarios of physics beyond the standard model. The limits reach up to 4.8 TeV, depending on the model, and extend previous exclusions from similar searches performed at lower collision energies. For the first time mass limits are set for the Randall–Sundrum graviton model in the dijet channel