Biologically-inspired data decorrelation for hyper-spectral imaging

Hyper-spectral data allows the construction of more robust statistical models to sample the material properties than the standard tri-chromatic color representation. However, because of the large dimensionality and complexity of the hyper-spectral data, the extraction of robust features (image descriptors) is not a trivial issue. Thus, to facilitate efficient feature extraction, decorrelation techniques are commonly applied to reduce the dimensionality of the hyper-spectral data with the aim of generating compact and highly discriminative image descriptors. Current methodologies for data decorrelation such as principal component analysis (PCA), linear discriminant analysis (LDA), wavelet decomposition (WD), or band selection methods require complex and subjective training procedures and in addition the compressed spectral information is not directly related to the physical (spectral) characteristics associated with the analyzed materials. The major objective of this article is to introduce and evaluate a new data decorrelation methodology using an approach that closely emulates the human vision. The proposed data decorrelation scheme has been employed to optimally minimize the amount of redundant information contained in the highly correlated hyper-spectral bands and has been comprehensively evaluated in the context of non-ferrous material classification

Design and synthesis of biofunctional magnetic/fluorescent glyco-nanoparticles and quantum dots and their application as specific molecular imaging probes

206 p.

Mass spectrometry coupled to imaging techniques: The better the view the greater the challenge

These are definitively exciting times for membrane lipid researchers. Once considered just as the cell membrane building blocks, the important role these lipids play is steadily being acknowledged. The improvement occurred in mass spectrometry techniques (MS) allows the establishment of the precise lipid composition of biological extracts. However, to fully understand the biological function of each individual lipid species, we need to know its spatial distribution and dynamics. In the past 10 years, the field has experienced a profound revolution thanks to the development of MS-based techniques allowing lipid imaging (MSI). Images reveal and verify what many lipid researchers had already shown by different means, but none as convincing as an image: each cell type presents a specific lipid composition, which is highly sensitive to its physiological and pathological state. While these techniques will help to place membrane lipids in the position they deserve, they also open the black box containing all the unknown regulatory mechanisms accounting for such tailored lipid composition. Thus, these results urges to different disciplines to redefine their paradigm of study by including the complexity revealed by the MSI techniques.

Diseño del blindaje de una sala de radiografía.

[ES]Este trabajo trata sobre el diseño del blindaje de una sala de rayos X. Concretamente se ha centrado en el procedimiento para diseñar el blindaje de una sala de radiografías del tórax. Para ello, se ha tomado como punto de partida una posible sala de radiografía de un centro sanitario y se le han aplicado a este caso las pautas que se deben seguir a la hora de hacer estos cálculos con el objetivo de reducir las dosis de radiación recibidas por el personal de operación y asegurar el bienestar del paciente y de los trabajadores Primero y todo para situar en el tema expuesto se ha descrito el contexto, donde se hace un breve resumen del desarrollo que han tenido los rayos X en el ámbito de la medicina. A continuación en el apartado de alcance se han explicado los campos que se van a abarcar en este proyecto. Por último y para acabar la introducción se han escrito lo beneficios del proyecto y su importancia. Para empezar el proyecto se ha presentado la sala de radiografía torácica tomada como ejemplo y se le han hecho los cálculos pertinentes a sus paredes, puertas y ventanas. A continuación se ha expuesto el aspecto económico y de la distribución y para ello se ha realizado un presupuesto y el diagrama de Gantt. Por último se han escrito unas conclusiones generales sobre todo el proyecto.

Visibility recovery on images acquired in attenuating media. Application to underwater, fog, and mammographic imaging

136 p.