{"id":53669,"date":"2018-03-09T22:41:23","date_gmt":"2018-03-09T22:41:23","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/depth-of-interaction-enhanced-gamma-ray-imaging-for-medical-applications\/"},"modified":"2018-03-09T22:41:23","modified_gmt":"2018-03-09T22:41:23","slug":"depth-of-interaction-enhanced-gamma-ray-imaging-for-medical-applications","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-medicas\/depth-of-interaction-enhanced-gamma-ray-imaging-for-medical-applications\/","title":{"rendered":"Depth of interaction enhanced gamma-ray imaging for medical applications"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Werner Lerche Christoph <\/strong><\/h2>\n<p>Se ha desarrollado un m\u00e9todo innovador para medir la profundidad de interacci\u00f3n de rayos-gamma en cristales de centelleo gruesos y continuos. La nueva t\u00e9cnica consiste en estimar este par\u00e1metro usando la anchura de la distribuci\u00f3n de luz de centelleo en los cristales que es detectada por un fotomultiplicador. para su medida r\u00e1pida y sencilla se ide\u00f3 una modificaci\u00f3n de muy bajo coste de los circuitos convencionales de divisi\u00f3n de carga que se usan con gran frecuencia para la determinaci\u00f3n de la posici\u00f3n del impacto en detectores de rayos-gamma para la medicina nuclear.  se presentaron medidas con un detector real, basado en un cristal de lso de dimensiones de 42mm x 42mm x 10mm  y un fotomultiplicador h8500 de hamamatsu photonics. La respuesta del detector consiste en los tres momentos no-triviales y el momento trivial. El momento trivial representa normalmente la energ\u00eda del impacto y los momentos no-triviales son los centroides y el segundo momento. Los experimentos muestran que los centroides no est\u00e1n afectados por la medida del momento adicional. La resoluci\u00f3n media en estos momentos es menor al 5 %. En los experimentos se observ\u00f3 una resoluci\u00f3n energ\u00e9tica media del 25 % con el valor m\u00ednimo en el centro del 17 % y el valor m\u00e1ximo en una de las esquinas del 70 %.  se present\u00f3 un algoritmo para la reconstrucci\u00f3n de la posici\u00f3n de impacto real a partir de los momentos. Para este fin se us\u00f3 un modelo anal\u00edtico de la distribuci\u00f3n de se\u00f1al, que se verific\u00f3 experimentalmente. Para los tres momentos no triviales se observ\u00f3 que las predicciones del modelo reproducen muy bien las medidas de estos momentos. Las desviaciones siempre estaban por debajo del 11 %, excepto para el momento trivial. En este \u00faltimo caso, las desviaciones siempre estaban por debajo del 25 %. Se us\u00f3 el modelo para predecir el comportamiento del detector en 40000 diferentes posiciones de impacto. Los resultados para los dos centroides y el seg<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Depth of interaction enhanced gamma-ray imaging for medical applications<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Depth of interaction enhanced gamma-ray imaging for medical applications <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Werner Lerche Christoph <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Universitat de val\u00e9ncia (estudi general)<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 30\/06\/2006<\/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> Benlloch Baviera Jos\u00e9 Mar\u00eda<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Antonio Ferrer soria <\/li>\n<li>filomeno S\u00e1nchez mart\u00ednez (vocal)<\/li>\n<li>Jos\u00e9 Bernabe\u00fa alberola (vocal)<\/li>\n<li>\u00e1ngel Sebasti\u00e1 cort\u00e9s (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Werner Lerche Christoph Se ha desarrollado un m\u00e9todo innovador para medir la profundidad de interacci\u00f3n de rayos-gamma [&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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