Guerrero , Andrés F. (2018) Desarrollo de una herramienta para la validación de algoritmos de análisis cuantitativo en estudios de perfusión en RMN (DCE-MRI). / Tool development for the validation of quantitative analysis algorithms in perfusion studes in (DCE-MRI). Maestría en Física Médica, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
La cuantificación de parámetros asociados a la perfusión sanguínea a través de imágenes dinámicas de resonancia magnética con contraste (DCE-MRI) es un proceso indirecto que involucra numerosas variables. Inconsistencias debidas a la inhomogeneidad del campo, movimientos del paciente, as como errores introducidos por la resolución temporal y espacial, la no localidad de la función arterial de entrada, ruido, entre varios otros, llevan a una estimación de parámetros con una incertidumbre asociada importante. Desarrollar una herramienta que permita validar algoritmos de cuantificación y estudiar sus grados de incertidumbre asociados es el propósito de esta tesis. En este trabajo se desarrollo un programa que permite controlar a voluntad diferentes parámetros de adquisición y, a partir de mapas paramétricos conocidos, simular adquisiciones DCE-MRI para ser procesadas por diferentes algoritmos de cuantificación. De esta manera, permite comparar el desempeño y sensibilidad de dichas herramientas. Finalmente, haciendo uso de un algoritmo de cuantificación, se expone el potencial del software al realizar un breve estudio de incertidumbres y sensibilidad, culminando con un estudio sobre la optimización de los tiempos de adquisición y niveles de ruido en la clínica.
Resumen en inglés
Quantitative imaging, based on dynamic contrast-enhanced magnetic resonance, is an estimation process that involves several variables. Inconsistencies due magnetic field inhomogeneities, patient movement, errors induced by the limited temporal and spatial resolution of the scanner, non-locality of the arterial input function and noise, among others, lead to estimated parameters with signicant uncertainties. Developing a tool that allows the user to guarantee the accuracy of quantication tools and to study their robustness and sensibility is the purpose of this thesis. In this work, a software tool that allows the user to set some acquisition parameters was depeloped, and by using known parametric maps, DCE-MRI acquisitions were simulated. The simulated images can be then processed using different quantication tools, enabling the user to compare their performance and sensitivity. By using a quantication tool, the potential of our software is shown. This was done by carrying out a robustness and sensibility test. Finally, an analysis of optimal acquisition times and noise levels is proposed.
| Tipo de objeto: | Tesis (Maestría en Física Médica) |
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| Palabras Clave: | Magnetic resonance; Resonancia magnética; [Magnetic resonance imaging; Imagen por resonancia magnética; Quantitative imaging; Imágenes cuantitativas; Radiomics; Radiomica; Two-compartment model; Modelo bicompartimental] |
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| Materias: | Medicina > Física médica |
| Divisiones: | Centro Integral de Medicina Nuclear y Radioterapia. Fundación INTECNUS |
| Código ID: | 764 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 08 Feb 2021 09:52 |
| Última Modificación: | 08 Feb 2021 09:52 |
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