{"id":81277,"date":"2018-03-10T00:05:10","date_gmt":"2018-03-10T00:05:10","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/adquisicion-de-imagenes-de-resonancia-magnetica-nuclear-mediante-tecnicas-de-submuestreo\/"},"modified":"2018-03-10T00:05:10","modified_gmt":"2018-03-10T00:05:10","slug":"adquisicion-de-imagenes-de-resonancia-magnetica-nuclear-mediante-tecnicas-de-submuestreo","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/adquisicion-de-imagenes-de-resonancia-magnetica-nuclear-mediante-tecnicas-de-submuestreo\/","title":{"rendered":"Adquisici\u00f3n de im\u00e1genes de resonancia magn\u00e9tica nuclear mediante t\u00e9cnicas de submuestreo."},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Perez Alcazar Pablo Roberto <\/strong><\/h2>\n<p>Esta tesis presenta y eval\u00faa el empleo de la t\u00e9cnica del submuestreo en el procesamiento de la se\u00f1al de resonancia magn\u00e9tica nuclear (rmn) cuando a\u00fan se encuentra en el rango de radiofrecuencias (r.F.), Con el prop\u00f3sito de introducir lo antes posible las ventajas potenciales del procesamiento digital, pero tratando a la vez de reducir las exigencias sobre los diferentes componentes electr\u00f3ncios a utilizar.El objetivo final es lograr un sistema de recosntrucci\u00f3n de im\u00e1genes m\u00e1s vers\u00e1til y de mejor calidad que los com\u00fanmente utilizados en la actualidad.  en el sistema propuesto se reemplazan las etapas anal\u00f3gicas tradicionales de demodulaci\u00f3n y filtrado y amplificaci\u00f3n en banda de base por un receptor digital directo basado en el submuestreo, reduciendo as\u00ed los requerimientos de memoria y capacidad de proceso que exige el sobremuestreo. Para este tipo de receptor se establecen las limitaciones que impone el propio proceso de submuestreo y el componente clave en su aplicaci\u00f3n, el conversor anal\u00f3gico-digital (cad). En particular se ha estudiado la degradaci\u00f3n producida en la relaci\u00f3n se\u00f1al-ruido (snr), muy dependiente de la velocidad de muestreo y posici\u00f3n de la banda. Esta degradaci\u00f3n se ha acotado, proponi\u00e9ndose una configuraci\u00f3n que permite conseguir resultados similares o mejores a los obtenidos con componentes anal\u00f3gicos m\u00e1s costosos y de comportamiento menos estable.  los resultados de lso experimentos realizados con se\u00f1ales de rmn confirman las predicciones te\u00f3ricas sobre relocalizaci\u00f3n de banda espectral, inversi\u00f3n de especro, bandas de aguarda, relaci\u00f3n se\u00f1al-ruido, etc., Demostrando que esta t\u00e9cnica, a\u00fan con las limitaciones indicadas, permite la aplicaci\u00f3n de los procesos digitales a sistemas donde el sobremuestreo no es todav\u00eda aplicable (o lo ser\u00eda a un coste elevado).  los resultados obtenidos enrelaci\u00f3n con la utilizaci\u00f3n del muestreo paso-banda (submuestreo) en el proceso de adquisici\u00f3<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Adquisici\u00f3n de im\u00e1genes de resonancia magn\u00e9tica nuclear mediante t\u00e9cnicas de submuestreo.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Adquisici\u00f3n de im\u00e1genes de resonancia magn\u00e9tica nuclear mediante t\u00e9cnicas de submuestreo. <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Perez Alcazar Pablo Roberto <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 18\/11\/1999<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Andres Santos Lleo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Cordoba herralde ricardo de <\/li>\n<li>Manuel Desco menendez (vocal)<\/li>\n<li>Francisco Del pozo guerrero (vocal)<\/li>\n<li>Juan  Jos\u00e9 Vaquero l\u00f3pez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Perez Alcazar Pablo Roberto Esta tesis presenta y eval\u00faa el empleo de la t\u00e9cnica del submuestreo en [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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