Soft tissue characterization using different quantitative ultrasound modalities

dc.contributor.advisorCastañeda Aphan, Benjamín
dc.contributor.advisorLavarello Montero, Roberto Janniel
dc.contributor.authorRomero Gutierrez, Stefano Enriquees_ES
dc.date.accessioned2019-10-25T00:42:02Zes_ES
dc.date.available2019-10-25T00:42:02Zes_ES
dc.date.created2019es_ES
dc.date.issued2019-10-24es_ES
dc.description.abstractQuantitative ultrasound has been used in several modalities for different experiments such as simulated phantom, physical phantoms, ex vivo and in vivo tissues. The potential of the ultrasound techniques could be useful to complemented medical diagnosis. In this work, two quantitative ultrasound techniques are applied on in vivo experiments: crawling waves sonoelastography applied to bicep brachii and a regularized power law for backscattering and attenuation coefficient for ovary tumor. A crawling waves sonoelastography (CWS) method was applied using two mini-shakers making parallel contact (conventional setup) and normal contact with the surface in two phantoms (homogeneous and inhomogeneous) using the phase derivative algorithm to assess the performance of the normal excitation with well-know metrics such as error, coefficient of variation, signal-to noise ratio and contrast-to noise ratio. The results suggest that the normal excitation provides comparable stiffness estimation in homogeneous and inhomogeneous phantoms. For in vivo test, a bicep barchii from healthy volunteers were assess in two experiments: relaxed-contracted and with a range weight of load. The application of normal setup indicated that a measurement of the relative stiffness on bicep brachii can be realized. The results indicated that a using the incremental weight causes a increase on the stiffness of the bicep following a linear behavior. A regularized power law (RPL) method was implemented and testing with simulated phantoms using a combination of the possible variables of data block size and the regularized parameters of the three variables of the backscattering and attenuation coefficients. The results showed that is possible provide accurate and precise backscattering and attenuation coefficient in the same algorithm. Additionally, in vivo breast experiments was performed and compared with the literature obtaining comparable results. Finally, a tumor of patients with suspected ovarian cancer were assess. The results suggests that RPL method and in general provides reasonable depictions of the reflectivity and attenuation of interrogated media.es_ES
dc.description.uriTesises_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12404/15255
dc.language.isoenges_ES
dc.publisherPontificia Universidad Católica del Perúes_ES
dc.publisher.countryPEes_ES
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectUltrasonidoes_ES
dc.subjectIngeniería de tejidoses_ES
dc.subjectCáncer--Diagnóstico por imágeneses_ES
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#2.02.05es_ES
dc.titleSoft tissue characterization using different quantitative ultrasound modalitieses_ES
dc.typeinfo:eu-repo/semantics/masterThesises_ES
renati.advisor.dni10791304
renati.discipline613077es_ES
renati.levelhttps://purl.org/pe-repo/renati/level#maestroes_ES
renati.typehttps://purl.org/pe-repo/renati/type#tesises_ES
thesis.degree.disciplineProcesamiento de Señales e Imágenes Digitaleses_ES
thesis.degree.grantorPontificia Universidad Católica del Perú. Escuela de Posgradoes_ES
thesis.degree.levelMaestríaes_ES
thesis.degree.nameMaestro en Procesamiento de Señales e Imágenes Digitales.es_ES

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