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Morfometria do trato vocal por ressonância magnética: simulação de padrões pato...
Sandra M. Rua Ventura; Diamantino Rui S. Freitas; Isabel Maria A. P. Ramos; João Manuel R. S. TavaresIntroduction The shape or morphologic analysis of anatomical structures, such as the vocal tract can be performed from two-dimensional (2D) or volumetric acquisitions (3D) of magnetic resonance imaging (MRI). This imaging technique has had an increasing use in the study of speech production. Objectives To determine a method to perform the morphometric analysis of the vocal tract from magnetic resonance imagin...
Morphologic Differences in the Vocal Tract Resonance Cavities of Voice Professi...
Sandra M. Rua Ventura; Diamantino Rui S. Freitas; Isabel Maria A. P. Ramos; João Manuel R. S. TavaresThe processes that take place during singing and acting are complex. However morphological and dynamic studies of the vocal tracts during speech have been gaining greater attention, mainly due to the rapid technical advances being made with Magnetic Resonance Imaging (MRI) and image analysis and processing techniques. Objectives/Hypothesis and methods: Our aim is to describe the morphological differences in th...
Speaker-specific articulatory assessment and measurements during Portuguese spe...
Sandra M. Rua Ventura; Maria João M. Vasconcelos; Diamantino Rui S. Freitas; Isabel Maria A. P. Ramos; João Manuel R. S. TavaresThe development of two and three-dimensional magnetic resonance imaging (MRI) opened new options for a better understanding of speech production; in particular, for the articulation process, comparing with other imaging techniques, such as x-rays. Several MRI studies have been carried out considering different languages, but concerning European Portuguese the available information is far from being completely a...
Towards the automatic study of the vocal tract from magnetic resonance images
Maria João M. Vasconcelos; Sandra M. Rua Ventura; Diamantino Rui S. Freitas; João Manuel R. S.TavaresOver the last few decades, researchers have been investigating the mechanisms involved in speech production. Image analysis can be a valuable aid in the understanding of the morphology of the vocal tract. The application of magnetic resonance imaging to study these mechanisms has been proven to be reliable and safe. We have applied deformable models in magnetic resonance images in order to conduct an automatic ...
Toward Dynamic Magnetic Resonance Imaging of the Vocal Tract During Speech Prod...
Sandra M. Rua Ventura; Diamantino Rui S. Freitas; João Manuel R.S. TavaresThe most recent and significant magnetic resonance imaging (MRI) improvements allow for the visualization of the vocal tract during speech production, which has revealed to be a powerful tool in dynamic speech research. However, a synchronization technique with enhanced temporal resolution is still required. Objectives/ Hypothesis and methods: Throughout this work, a technique for the dynamic study of the vocal...
Utilização da Imagem por Ressonância Magnética nos Estudos sobre a Produção da ...
Sandra M. Rua Ventura; Diamantino Rui S. Freitas; Isabel Maria A. P. Ramos; João Manuel R. S. TavaresA fala é uma ferramenta única de comunicação, que envolve um conjunto de órgãos que trabalham sincronamente na produção de sons. Os mecanismos envolvidos são complexos, sendo várias as técnicas de estudo da fala, quer do ponto de vista acústico, quer do ponto de vista morfológico. A ressonância magnética tem revelado potencialidades únicas no estudo do tracto vocal, e que são aqui destacadas. O principal object...
Using Statistical Deformable Models to Reconstruct Vocal Tract Shape from Magne...
Maria João M. Vasconcelos; Sandra M. Rua Ventura; Diamantino Rui S. Freitas; João Manuel R. S. TavaresThe mechanisms involved in speech production are complex and have thus been subject to growing attention by the scientific community. Magnetic Resonance Imaging (MRI) has been proven to be a powerful means in the understanding of the morphology of the vocal tract. Over the last few years, statistical deformable models have been successfully used to identify and characterize bones and organs in medical images an...
Analysis of Tongue Shape and Motion in Speech Production using Statistical Mode...
Maria João Medeiros de Vasconcelos; Sandra M. Rua Ventura; João Manuel R. S. Tavares; Diamantino Rui S. FreitasThe mechanisms of speech production are complex and have been raising attention from researchers of both medical and computer vision fields. In the speech production mechanism, the articulator’s study is a complex issue, since they have a high level of freedom along this process, namely the tongue, which instigates a problem in its control and observation. In this work it is automatically characterized th...
Magnetic Resonance Imaging of the Vocal Tract: Techniques and Applications
Sandra M. Rua Ventura; Diamantino Rui S. Freitas; João Manuel R. S. TavaresMagnetic resonance (MR) imaging has been used to analyse and evaluate the vocal tract shape through different techniques and with promising results in several fields. Our purpose is to demonstrate the relevance of MR and image processing for the vocal tract study. The extraction of contours of the air cavities allowed the set-up of a number of 3D reconstruction image stacks by means of the combination of orthog...
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