ESS - RAD - Radiologia
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Browsing ESS - RAD - Radiologia by Subject "3D modeling"
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- Imaging of the Vocal Tract based on Magnetic Resonance TechniquesPublication . Ventura, Sandra Rua; Freitas, Diamantino Rui; Tavares, João ManuelMagnetic resonance (MR) imaging has been used to analyze and evaluate the vocal tract shape through different techniques and with promising results in several application fields. Our main purpose is to demonstrate the relevance of MR and techniques of image processing in the analysis of vocal tract.
- Magnetic resonance imaging of the vocal tract: techniques and applicationsPublication . Ventura, Sandra Moreira Rua; Freitas, Diamantino Rui; Tavares, João ManuelMagnetic 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 orthogonally oriented sets of slices for e ach articulatory gesture, as a new approach to solve the expected spatial under sampling of the imaging process. In result these models give improved information for the visualization of morphologic and anatomical aspects and are useful for partial measure ments of the vocal tract shape in different situations. Potential use can be found in Medical and therapeutic applications as well as in acoustic articulatory speech modelling.
- Morphological Dynamic Study of Human Vocal TractPublication . Ventura, Sandra Rua; Freitas, Diamantino RuiMagnetic resonance imaging (MRI) has been successfully used in speech research, with the development of high B-value units and ultra-fast acquisition sequences, to obtain morphological and dynamic data of the vocal tract. This knowledge is useful for the understanding of speech mechanisms and can, in particular be employed for speech synthesis. The aim of our study was a combination of the morphological and dynamical characterizations of speech, resulting in the production of 3D articulatory models of some relevant Portuguese sounds and syllables. A set of static images in stacks and dynamic sequences were collected during the experiments from subjects that were instructed to vocalize during the acquisition, exploring the capabilities of the equipment. Analysis of the image stacks allowed the extraction of the vocal tract contours and a subsequent non-conventional 3D reconstruction by means of combination of orthogonal stacks allowed visualization and partial measurement of the sampled vocal tract shape.
- Morphological Dynamic Study of Human Vocal TractPublication . Ventura, Sandra Rua; Freitas, Diamantino RuiWith the development of high B-value units and ultra-fast acquisition sequences, magnetic resonance imaging (MRI) has been successfully used in speech research to obtain morphological and dynamic data of the vocal tract