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dc.rights.licenseAtribución-SinDerivadas 4.0 Internacional
dc.contributor.advisorRomero Castro, Edgar Eduardo
dc.contributor.authorJaramillo González, María
dc.date.accessioned2023-01-26T14:06:30Z
dc.date.available2023-01-26T14:06:30Z
dc.date.issued2022
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/83139
dc.descriptionilustraciones, fotografías, graficas
dc.description.abstractPancreatic Cancer (PC) is one of the most aggressive cancers, constituting the seventh leading cause of cancer-related death globally in 2020. Usually, the asymptomatic response of PC causes the delayed diagnosis of the disease. Diagnosis of PC usually includes ultrasonography (US), computed tomography (CT), magnetic resonance (MRI), and endoscopic ultrasound (EUS). Although EUS is the diagnostic method with the highest sensitivity reported, the procedure is highly operator-dependent. A gastroenterologist requires more than 150 supervised procedures to interpret the anatomy blurred by several noise sources. Therefore, a second reader may be desirable to support the procedure and assist the training process in a gastroenterology service. Some computational strategies have been developed to detect PC in EUS images, but those methods are semi-automatic in practice and very susceptible to noise. Hence, the main contribution of this work is an automatic strategy to detect PC in complete video sequences of EUS procedures. The proposed methodology describes the mixture of echo patterns using the Speeded-Up Robust Features (SURF) method. A set of interest points are defined and described correlating the echo patterns in a multiscale analysis, and filtering the noise sources, usually uncorrelated among different scales. Then, images with PC are differentiated by a binary classification method, evaluating Support Vector Machines and Adaboost models. Additionally, the proposed method is assessed using a public EUS database constructed and released in this work, with 55 cases. Finally, the proposed method was compared with typical Deep Learning approaches, reaching an accuracy of 92.1\% and 90.0\%, respectively. In addition, the method herein proposed is also stable in experiments with added noise, while the nets fail to maintain a similar performance.
dc.description.abstractEl Cáncer de Páncreas (CP) fue la séptima causa de muerte por cáncer en el mundo en 2020. Es uno de los más agresivos y en la mayoría de los casos se diagnostica en etapas avanzadas por su respuesta asintomática. El diagnóstico del CP se realiza mediante técnicas de imágen como ultrasonido (US), tomografía computarizada(TAC), resonancia magnética(RMN) y Ecoendoscopia(EE). Aunque la EE tiene la más alta sensibilidad, el proceso de entrenamiento de los especialistas requiere más de 150 procedimientos supervisados, convirtiendose en un procedimiento altamente dependiente de la experticia del gastroenterólogo y del manejo de las múltiples fuentes de ruido durante el procedimiento. Por lo tanto, es deseable un segundo lector para apoyar el procedimiento y asistir el proceso de entrenamiento. Se han desarrollado estrategias computacionales para apoyar la detección del CP, pero son semi-automáticos en la práctica y altamente suceptibles a las fuentes de ruido. La principal contribución de este trabajo es el desarrollo de una estrategia automática para detectar CP en secuencias de video completas de procedimientos de EE. El método describe los eco-patrones en imágenes de EE utilizando el algoritmo “SURF” por sus siglas en inglés. Se definen y describen un conjunto de puntos de interés correlacionados en un análisis multiecala y se filtran las fuentes de ruido que usualmente no se correlacionan entre escalas. Luego, las imágenes con CP se diferencian mediante una clasificación binaria utilizando métodos de soporte vectorial y árboles de decisión. Adicionalmente, el método se evalúa utilizando una base de datos pública construida en este trabajo con 55 casos en total. Finalmente, el rendimiento se compara con los enfoques típicos de aprendizaje profundo, obteniendo un rendimiento de 92.1\% y 90.0\%, respectivamente. Adicionalmente, el metodo propuesto es estable en experimentos al adicionar ruido, en los que las redes fallan en mantener un rendimiento similar. (Texto tomado de la fuente)
dc.format.extentxvi, 77 páginas
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherUniversidad Nacional de Colombia
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subject.ddc610 - Medicina y salud
dc.subject.ddc620 - Ingeniería y operaciones afines
dc.subject.otherNeoplasias Pancreáticas
dc.subject.otherPancreatic Neoplasms
dc.subject.otherDiagnóstico por Imagen
dc.subject.otherDiagnostic Imaging
dc.titleDetection of pancreatic malignant tumors based on texture characterization during endoscopy ultrasound video sequences
dc.typeTrabajo de grado - Maestría
dc.type.driverinfo:eu-repo/semantics/masterThesis
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.publisher.programBogotá - Medicina - Maestría en Ingeniería Biomédica
dc.description.notesFurther author information: (Send correspondence to María Jaramillo) Diego Bravo: E-mail: marjaramillogon@unal.edu.co, Telephone: +57 3137214469
dc.contributor.researcherGómez Zuleta, Martín Alonso
dc.contributor.researchgroupCim@Lab
dc.description.degreelevelMaestría
dc.description.degreenameMagíster en Ingeniería Biomédica
dc.description.researchareaDigital Anatomy by Images Research
dc.description.researchareaApplied Computing - Image Processing
dc.identifier.instnameUniversidad Nacional de Colombia
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombia
dc.identifier.repourlhttps://repositorio.unal.edu.co/
dc.publisher.facultyFacultad de Medicina
dc.publisher.placeBogotá, Colombia
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotá
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccess
dc.subject.proposalPancreatic cancer
dc.subject.proposalAdenocarcinoma
dc.subject.proposalDetection
dc.subject.proposalDifferentiation
dc.subject.proposalEndoscopic ultrasound
dc.subject.proposalEchoendoscopy
dc.subject.proposalImage classification
dc.subject.proposalCáncer de páncreas
dc.subject.proposalAdenocarcinoma
dc.subject.proposalDetección
dc.subject.proposalDiferenciación
dc.subject.proposalEcoendoscopia
dc.subject.proposalClasificación de imágenes
dc.title.translatedDetección de tumores pancreáticos malignos basado en la caracterización de textura durante secuencias de video de ultrasonido endoscópico
dc.type.coarhttp://purl.org/coar/resource_type/c_bdcc
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.contentText
dc.type.redcolhttp://purl.org/redcol/resource_type/TM
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2
dcterms.audience.professionaldevelopmentEstudiantes
dcterms.audience.professionaldevelopmentGrupos comunitarios
dcterms.audience.professionaldevelopmentInvestigadores
dc.contributor.cvlachttps://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0001598592
dc.contributor.researchgatehttps://www.researchgate.net/profile/Maria-Gonzalez-468


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