ESS - RAD - Posters apresentados em eventos científicos
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- Genetic variants at the Wnt/[beta]-catenin and oestrogen receptor signalling pathways are associated with low bone mineral density in dancersPublication . Amorim, Tânia; Durães, Cecília; Maia, José; Machado, José Carlos; Nogueira, Luísa; Adubeiro, Nuno; Flouris, Andreas D.; Metsios, George S.; Marques, Franklim; Wyon, Matthew; Koutedakis, YiannisResearch suggests that dancers are at higher risk of developing low bone mineral density (BMD) compared with the general population. However, the associated factors contributing to low BMD in dancers are not fully understood. We aimed to assess the association of single-nucleotide polymorphisms (SNPs) in the Wnt/b-catenin and oestrogen receptor (ER) signalling pathways with low BMD in dancers.
- Computed Tomography Enterography: Contrast agent use in small-bowel imaging and distensibility assessmentPublication . Baptista, Lurdes; Ventura, Sandra RuaThe imaging analysis of the gastrointestinal tract is still a challenge for radiologists, surgeons and gastroenterologists. However, due to the technical advances of multislice computed tomography (CT) and the wide variety of oral contrast agents currently available, the Enterography technique has been an important method for this study.
- Radiographer’s best practices for image quality assurance in diagnostic pediatric pelvic radiopraphsPublication . Miranda, Joana; Cardoso, Paula; Ventura, Sandra RuaIn pediatric diagnostic imaging, the image quality must be a constant concern to radiographers and orientated to the particular clinical problem. Pelvic radiographs are a common examination in children requiring specific preparation to be achieved. Our study aim to demonstrate the relevance of best practices when performing pediatric pelvic radiographs to improve diagnostic quality.
- Assessment of radiation protection practices among Bachelor’s Radiology students of ESTSP- IPPPublication . Sousa, Mariana; Ventura, Sandra RuaWith the increasing use of ionizing radiation as a diagnostic tool in addition to the medical advances in the field of interventional radiology, a greater exposure by workers and students is expectable. For this reason, a greater focus should be given to the radiological protection measures used, in particularly for the students of Radiology Course, as well as a closer monitoring of radiation exposure. The main goal of our project was to investigate and characterize which are the radiation safety and protection practices adopted by the students during their practical internships at hospitals.
- 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.
- The use and relevance of gonal protection shields in children during hips radiographyPublication . Silva, César; Silva, Pedro N.; Ventura, Sandra RuaConsidering that ionizing radiation effects are cumulative and the gonads are particularly sensitive to these effects, and also the clinical importance of pelvic radiographs in children, the excess of radiation exposure to the gonads must be avoided. The purpose of this study is to demonstrate the relevance of the correct use of gonad protection shields and to evaluate their use on the hip radiographs performed in a reference clinical institution, through the retrospective analysis of pelvic radiographic images performed in children. According the image quality assessment, 20 (40%) patients were unprotected and gonads shields were incorrectly placed in 24 (80%) patients.
- Segmentation and 3D reconstruction of the vocal tract from MR images – a comparative studyPublication . Ventura, Sandra Rua; Freitas, Diamantino Rui S.; Ramos, Isabel Maria; Tavares, João Manuel R.S.Speech production is an important human function involving a set of organs with specific morphological and dynamic aspects. The inter-speaker variability, the coarticulation or the nasality are some interesting aspects to improve a realistic 3D modeling of the vocal tract. For this, the understanding of the mechanism of speech production is crucial, as the current image data is not sufficient to reproduce truthfully the speakers anatomy and articulation. Hence, the goal of 3D modeling is to generate the complete geometrical and dynamical information concerning the vocal tract from medical images, such as from magnetic reso-nance imaging (MRI). This work aims to describe and compare two different segmentation techniques to at-tain the 3D shape of the vocal tract during speech production from MR images: the former based on manual tracing of the vocal tract contours and the latter based on image thresholding. Thus, the segmented cross-sectional areas were measured, and 3D models were built from the sagittal data by blending the contours ob-tained from the two segmentation techniques. The mean error of the measures computed were low for both segmentation techniques, which let us conclude that the techniques are useful to evaluate the vocal tract ge-ometry accurately. Additionally, the 3D models built using both segmentation techniques were also very similar and truthful. However, when the coronal data was used, various difficulties occurred.
- Principal hazards and health effects of magnetic resonance imagingPublication . Silva, Vitor M. Fonseca; Ventura, Sandra Rua