{"id":94312,"date":"2018-03-11T10:14:01","date_gmt":"2018-03-11T10:14:01","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/intracranial-fluids-dynamics-a-quantitative-evaluation-by-means-of-phase-contrast-magnetic-resonance-imaging\/"},"modified":"2018-03-11T10:14:01","modified_gmt":"2018-03-11T10:14:01","slug":"intracranial-fluids-dynamics-a-quantitative-evaluation-by-means-of-phase-contrast-magnetic-resonance-imaging","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/tecnologia-de-las-telecomunicaciones\/intracranial-fluids-dynamics-a-quantitative-evaluation-by-means-of-phase-contrast-magnetic-resonance-imaging\/","title":{"rendered":"Intracranial fluids dynamics: a quantitative evaluation by means of phase-contrast magnetic resonance imaging"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Yudy Natalia Florez Ordonez <\/strong><\/h2>\n<p>El volumen intracraneal lo integran el volumen de l\u00edquido cefalorraqu\u00eddeo (lcr), el de la sangre y el del par\u00e9nquima cerebral. La entrada de sangre al cr\u00e1neo en la s\u00edstole incrementa el volumen intracraneal. Seg\u00fan la ley de monroe-kellie debe ocurrir una descompensaci\u00f3n en los vol\u00famenes restantes para mantener constante el volumen total. Los desequilibrios que se producen en este proceso de la homeostasis cerebral se han asociado tanto a enfermedades neurodegenerativas como a cerebrovasculares. Por tanto, es necesario contar con metodolog\u00edas adecuadas para analizar la din\u00e1mica de los fluidos intracraneales (lcr y sangre). \tlas secuencias din\u00e1micas de resonancia magn\u00e9tica en contraste de fase  (rm-cf) con sincronismo card\u00edaco permiten  cuantificar el flujo de lcr y de sangre durante un ciclo card\u00edaco. La medici\u00f3n de flujo mediante secuencias de rm-cf es precisa y reproducible siempre que se use un protocolo de adquisici\u00f3n adecuado. La reproducibilidad y exactitud de las medidas dependen tambi\u00e9n del uso de t\u00e9cnicas adecuadas de posproceso que permitan segmentar las regiones  de inter\u00e9s (roi) independientemente del operador y admitan corregir los errores de fondo introducidos por la supresi\u00f3n imperfecta de las corrientes inducidas y la contribuci\u00f3n a la se\u00f1al de los peque\u00f1os movimientos que presenta el mesenc\u00e9falo por la transmisi\u00f3n del pulso vascular as\u00ed como el submuestreo (aliasing), reflejado como un cambio abrupto y opuesto del sentido original del flujo. Estas t\u00e9cnicas de an\u00e1lisis deben tambi\u00e9n tener en cuenta los errores relacionados con el efecto de volumen parcial (evp), causado por la presencia de tejido estacionario y de flujo en el interior de los v\u00f3xeles de la periferia de la regi\u00f3n a estudiar \tel objetivo principal de esta tesis es desarrollar una metodolog\u00eda reproducible para evaluar cuantitativamente la din\u00e1mica de los fluidos intracraneales dentro de espacios de lcr (acueducto de silvio, cisterna prepontina y espacio perimedular c2c3) y principales va<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Intracranial fluids dynamics: a quantitative evaluation by means of phase-contrast magnetic resonance imaging<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Intracranial fluids dynamics: a quantitative evaluation by means of phase-contrast magnetic resonance imaging <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Yudy Natalia Florez Ordonez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Valencia<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 22\/06\/2009<\/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>David Moratal Perez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: olivier Baledent <\/li>\n<li>enrique Moll\u00e1 olmos (vocal)<\/li>\n<li>Manuel Monle\u00f3n pradas (vocal)<\/li>\n<li>bonaventura Casanova estruch (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Yudy Natalia Florez Ordonez El volumen intracraneal lo integran el volumen de l\u00edquido cefalorraqu\u00eddeo (lcr), el de [&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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