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Publicações

Publicações por Catarina Brito Carvalho

2013

Classification Approach for Measurement of Atherosclerosis Using B-Mode Ultrasound Carotid Images

Autores
Carvalho, C; Rocha, R; Campilho, A;

Publicação
IMAGE ANALYSIS AND RECOGNITION

Abstract
This paper presents an approach for the detection and delineation of the interfaces at the near and far walls of carotid artery using B-mode ultrasound images. After the delineation the system measures automatically the carotid intima-media thickness (IMT) in order to aid the diagnosis of the atherosclerosis. In this method we start by the measurement, at a pixel level, of local features followed by the selection of the most discriminant ones. The next stage is a classification step which assigns a probability to the pixels to belong to an interface, enabling the detection of the carotid artery interfaces. The final artery boundaries are delineated using a dynamic programming approach. The final measurements of IMT produced by the automatic method proposed in this paper were compared with three manual tracings of experts. It was also compared with an automatic method previously developed. The results show that the two automatic detection methods have similar performance, although with slight improvements in the new method, particularly for the the far wall interface.

2018

3D Tendon Strain Estimation Using High-frequency Volumetric Ultrasound Images: A Feasibility Study

Autores
Carvalho, C; Slagmolen, P; Bogaerts, S; Scheys, L; D'hooge, J; Peers, K; Maes, F; Suetens, P;

Publicação
Ultrasonic Imaging

Abstract

2017

Evaluation of tissue displacement and regional strain in the Achilles tendon using quantitative high-frequency ultrasound

Autores
Bogaerts, S; Carvalho, CD; Scheys, L; Desloovere, K; D'hooge, J; Maes, F; Suetens, P; Peers, K;

Publicação
PLOS ONE

Abstract
The Achilles tendon has a unique structure-function relationship thanks to its innate hierarchical architecture in combination with the rotational anatomy of the sub-tendons from the triceps surae muscles. Previous research has provided valuable insight in global Achilles tendon mechanics, but limitations with the technique used remain. Furthermore, given the global approach evaluating muscle-tendon junction to insertion, regional differences in tendon mechanical properties might be overlooked. However, recent advancements in the field of ultrasound imaging in combination with speckle tracking have made an intratendinous evaluation possible. This study uses high-frequency ultrasound to allow for quantification of regional tendon deformation. Also, an interactive application was developed to improve clinical applicability. A dynamic ultrasound of both Achilles tendons of ten asymptomatic subjects was taken. The displacement and regional strain in the superficial, middle and deep layer were evaluated during passive elongation and isometric contraction. Building on previous research, results showed that the Achilles tendon displaces non-uniformly with a higher displacement found in the deep layer of the tendon. Adding to this, a non-uniform regional strain behavior was found in the Achilles tendon during passive elongation, with the highest strain in the superficial layer. Further exploration of tendon mechanics will improve the knowledge on etiology of tendinopathy and provide options to optimize existing therapeutic loading programs.

2015

Continuous ultrasound speckle tracking with Gaussian mixtures

Autores
Schretter, C; Jianyong Sun,; Bundervoet, S; Dooms, A; Schelkens, P; de Brito Carvalho, C; Slagmolen, P; D'hooge, J;

Publicação
2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

Abstract

2018

A robust anisotropic edge detection method for carotid ultrasound image processing

Autores
Rouco, J; Carvalho, C; Domingues, A; Azevedo, E; Campilho, A;

Publicação
Procedia Computer Science

Abstract

2016

3D tendon strain estimation on high-frequency 3D ultrasound images a simulation and phantom study

Autores
Carvalho, C; Bogaerts, S; Scheys, L; D'hooge, J; Peers, K; Suetens, P;

Publicação
2016 IEEE 13th International Symposium on Biomedical Imaging (ISBI)

Abstract

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