Mancuzo , Ariel D. (2017) Evaluación del modelo EPID AS1200 y puesta en funcionamiento de la dosimetría portal para diferentes energías de fotones. / Evaluation of the EPID AS1200 model setting up portal dosimetry for different photon energies. Maestría en Física Médica, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
El uso de detectores de radiación basados en silicio amorfo se ha convertido en el estándar para la adquisición de imágenes empleando haces de megavoltaje en radioterapia. A partir del hecho de que las imágenes obtenidas contienen información sobre la distribución de dosis, estos instrumentos han encontrado utilidad en el control de calidad paciente especifico. El presente trabajo tuvo como objetivos examinar las características dosimétricas del dispositivo electrónico de imágenes portales (EPID) aS1200, analizando sus bondades y limitaciones. Asimismo, se pretendió evaluar el algoritmo de predicción de imágenes portales y comisionar el sistema de dosimetría portal para diferentes haces de fotones de la unidad de tratamiento TrueBeam STx®. Las pruebas dosimétricas arrojaron resultados positivos en los que se observaron mejoras concretas con respecto a versiones de EPIDs anteriores. El comisionamiento se aplicó con éxito, verificando la efectividad del algoritmo mediante un conjunto de experimentos y planes de tratamiento, utilizando el método gamma. Se concluyó que el sistema de dosimetría portal propuesto por Varian para la realización de verificación pre-tratamiento es una herramienta de uso sencilla y precisa que permite determinar con rapidez y objetividad la aplicación del tratamiento sobre el paciente.
Resumen en inglés
The use of radiation detectors based on amorphous silicon has become the standard for image acquisition using megavoltage beams in radiotherapy. From the fact that the obtained images contain information about the dose distribution, these instruments have found utility in the patient-specific quality assurance. The goal of this work was to examine the dosimetric characteristics of the electronic portal image device (EPID) aS1200, analyzing its benefits and limitations. Likewise, it was intended to evaluate the portal image prediction algorithm and commission the portal dosimetry system for different photon beams from the TrueBeam STx® treatment unit. The dosimetric tests yielded positive results in which concrete improvements were observed with respect to previous versions of EPIDs. The commissioning was applied successfully, verifying the effectiveness of the algorithm through a set of experiments and treatment plans, using the gamma method. It was concluded that the portal dosimetry system proposed by Varian for the realization of pre-treatment verification is a simple and precise tool that allows to quickly and objectively determine the application of the treatment on the patient.
| Tipo de objeto: | Tesis (Maestría en Física Médica) |
|---|---|
| Palabras Clave: | Dosimetry; Dosimetría; Radioterapy; Radioterapia; [Portal dosimetry; Dosimetría portal; Pre-treatment verification; Verificación pre-tratamiento; Amorphous silicon; Silicio amorfo] |
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| Materias: | Medicina > Imagenología Medicina > Dosimetría Medicina > Física médica |
| Divisiones: | Fundación Centro de Medicina Nuclear y Molecular de Entre Ríos |
| Código ID: | 669 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 06 Jul 2018 16:05 |
| Última Modificación: | 06 Jul 2018 16:05 |
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