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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2020.tde-08042021-115239
Document
Author
Full name
Tayran Milá Mendes Olegário
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2020
Supervisor
Committee
Lima, Raúl González (President)
Barra, Luis Paulo da Silva
Furuie, Sérgio Shiguemi
Title in Portuguese
Modificações em imagens de CT-scan para a construção de um atlas anatômico do tórax humano.
Keywords in Portuguese
Anatomia
Atlas anatômico
Escápula
Segmentação de imagens
Tomografia
Abstract in Portuguese
A geração de imagens através de técnicas como Tomografia por Impedância Elétrica (TIE) e Tomografia por Ultrassom (TUS) requerem a solução de um problema inverso mal-posto. Pode-se regularizar tais problemas utilizando uma abordagem bayesiana que requer o uso de um atlas anatômico. Para construir um atlas anatômico do tórax, pode-se utilizar amostras de CT-Scan que são adquiridas em condições diferentes das necessárias para a construção de um atlas anatômico para TIE e TUS: exames de CT-Scan geralmente são obtidos com o paciente mantendo os braços para cima, enquanto os exames de TIE e TUS são realizados com o paciente mantendo os braços para baixo. Neste trabalho, desenvolveu-se um método que utiliza imagens de CT-Scan para gerar amostras que possam ser usadas na construção de um atlas anatômico para TIE e TUS. Este método desloca a escápula e a clavícula para uma região compatível com a posição destas estruturas em um paciente mantendo os braços para baixo e estima a distribuição de tecido mole de um paciente na condição de uso de TIE e TUS.
Title in English
Modifications on CT-Scans for the computation of an anatomical atlas of the human chest.
Keywords in English
Anatomical atlas
Anatomy (Statistical model)
Image segmentation
Scapular movement
Abstract in English
The generation of images from techniques such as Electrical Impedance Tomography (EIT) and Ultrasound Tomography (UST) requires the solution of an ill-posed inverse problem. The regularization of such problems using a bayesian approach requires an anatomical atlas. One can construct an anatomical atlas of the thorax using samples from CT-scan. However, these samples are usually acquired under different conditions from those necessary for EIT and UST application: patients usually keep their arms up during CT-scan exam while, during UST and EIT, patients maintain their arms down. This work presents a method that uses CT-scan to generate samples that follow the requirements for the construction of an anatomical atlas for EIT and UST application. This method moves the scapula and the clavicle to a region compatible with the position of these structures in a patient keeping the arms down and also estimates the distribution of a patient's soft tissue under the condition of EIT and UST exams.
 
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Publishing Date
2021-04-14
 
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