{"id":71421,"date":"2018-03-09T23:16:03","date_gmt":"2018-03-09T23:16:03","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/evaluacion-del-enfisema-pulmonar-mediante-analisis-cuantitativo-de-imagen-en-tomografa%c2%ada-computarizada-y-variables-fisiologicas\/"},"modified":"2018-03-09T23:16:03","modified_gmt":"2018-03-09T23:16:03","slug":"evaluacion-del-enfisema-pulmonar-mediante-analisis-cuantitativo-de-imagen-en-tomografa%c2%ada-computarizada-y-variables-fisiologicas","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-medicas\/evaluacion-del-enfisema-pulmonar-mediante-analisis-cuantitativo-de-imagen-en-tomografa%c2%ada-computarizada-y-variables-fisiologicas\/","title":{"rendered":"Evaluaci\u00f3n del enfisema pulmonar mediante an\u00e1lisis cuantitativo de imagen en tomograf\u00edacomputarizada y variables fisiol\u00f3gicas"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Luis Gabriel Arango Isaza <\/strong><\/h2>\n<p>La tomograf\u00eda computarizada de alta resoluci\u00f3n (tcar) es el m\u00e9todo m\u00e1s fiable de diagn\u00f3stico in vivo del enfisema pulmonar. En la tcar el enfisema se aprecia en forma de \u00e1reas de baja atenuaci\u00f3n correspondientes a densidades menor -960 uh. La cuantificaci\u00f3n de estas \u00e1reas se realiza mediante una m\u00e1scara de densidad para el valor umbral mencionado. El m\u00e9todo tiene el inconveniente de que en el pulm\u00f3n normal existe un n\u00famero variable de estas \u00e1reas las cuales no constituyen un patr\u00f3n de enfisema. El objetivo de la tesis ha sido dise\u00f1ar un m\u00e9todo capaz de superar las limitaciones de la cuantificaci\u00f3n basada en un par\u00e1metro \u00fanico. Se ha empleado an\u00e1lisis de texturas (estad\u00edsticos de primer y segundo orden) y matriz run-length. el procedimiento ha consistido en una primera fase de discriminaci\u00f3n y una segunda de clasificaci\u00f3n. La evaluaci\u00f3n se ha hecho en regiones de inter\u00e9s (rois) de enfisema, pulm\u00f3n normal y fibrosis. La selecci\u00f3n de par\u00e1metros se ha realizado mediante an\u00e1lisis discriminante (m\u00e9todo por pasos o stepwise). se han obtenido seis par\u00e1metros de la matriz de concurrencia y los correspondientes coeficientes para las funciones de fisher. El resultado de la clasificaci\u00f3n es de 93,3% para enfisema, 91,7% para pulm\u00f3n normal y 100% para fibrosis. la validaci\u00f3n mediante m\u00e9todo de leave one out dio 91,6% para enfisema, 90,1 para rois normal y 100% para fibrosis. La curva roc dio un \u00e1rea de 0,979.  en conclusi\u00f3n, el m\u00e9todo tiene una elevada precisi\u00f3n lo cual le convierte en una potencial alternativa a los m\u00e9todos densitom\u00e9tricos. Finalmente los par\u00e1metros se han implementado en una herramienta para la cuantificaci\u00f3n autom\u00e1tica del enfisema pulmonar (emphysema-quant).<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Evaluaci\u00f3n del enfisema pulmonar mediante an\u00e1lisis cuantitativo de imagen en tomograf\u00edacomputarizada y variables fisiol\u00f3gicas<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Evaluaci\u00f3n del enfisema pulmonar mediante an\u00e1lisis cuantitativo de imagen en tomograf\u00edacomputarizada y variables fisiol\u00f3gicas <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Luis Gabriel Arango Isaza <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 25\/11\/2004<\/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>Manuel Desco Men\u00e9ndez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: rafael Enr\u00edquez de salamanca <\/li>\n<li>  (vocal)<\/li>\n<li>  (vocal)<\/li>\n<li>  (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Luis Gabriel Arango Isaza La tomograf\u00eda computarizada de alta resoluci\u00f3n (tcar) es el m\u00e9todo m\u00e1s fiable 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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