26 documents found, page 1 of 3
Wearable Devices for Respiratory Monitoring
Vicente, Bernardo A.; Sebastião, Raquel; Sencadas, VitorRespiratory diseases are currently monitored through traditional pulmonary function tests, such as spirometry. However, the restrictions of these procedures, particularly in the context of the COVID-19 pandemic, have underscored the need for alternative approaches to respiratory health assessment. Wearable devices have emerged as a promising solution, providing continuous data collection, and overcoming the lim...
Multimodal classification of anxiety based on physiological signals
Vaz, Mariana; Summavielle, Teresa; Sebastião, Raquel; Ribeiro, Rita P.Multiple studies show an association between anxiety disorders and dysregulation in the Autonomic Nervous System (ANS). Thus, understanding how informative the physiological signals are would contribute to effectively detecting anxiety. This study targets the classification of anxiety as an imbalanced binary classification problem using physiological signals collected from a sample of healthy subjects under a n...
Characterisation of physiological responses to odours in autism spectrum disord...
Pereira, Lara; Grave, Joana; Noll, Janina; Derntl, Birgit; Soares, Sandra C.; Brás, Susana; Sebastião, RaquelAbnormal sensory perception is among the earliest symptoms of autism spectrum disorders (ASD). Despite mixed findings, olfactory perception seems to be altered in ASD. There is also evidence that automatic responses to odours can serve as biomarkers of ASD. However, this potential use of odour-based biomarkers for ASD is still underexplored. In this study, we aimed to investigate whether physiological responses...
Using the electrocardiogram for pain classification under emotional contexts
Silva, Pedro; Sebastião, RaquelThe adequate characterization of pain is critical in diagnosis and therapy selection, and currently is subjectively assessed by patient communication and self-evaluation. Thus, pain recognition and assessment have been a target of study in past years due to the importance of objective measurement. The goal of this work is the analysis of the electrocardiogram (ECG) under emotional contexts and reasoning on the ...
Biometric recognition: a systematic review on electrocardiogram data acquisitio...
Pereira, Teresa M. C.; Conceição, Raquel C.; Sencadas, Vítor; Sebastião, RaquelIn the last decades, researchers have shown the potential of using Electrocardiogram (ECG) as a biometric trait due to its uniqueness and hidden nature. However, despite the great number of approaches found in the literature, no agreement exists on the most appropriate methodology. This paper presents a systematic review of data acquisition methods, aiming to understand the impact of some variables from the dat...
Breast MRI Multi-Tumor Segmentation using 3D Region Growing
Pelicano, Ana Catarina; Godinho, Daniela M.; Gonçalves, Maria C. T.; Castela, Tiago; Orvalho, Maria Lurdes; Sencadas, Vitor; Sebastião, RaquelBreast tumor is one of the most prominent indicators for diagnosis of breast cancer. Magnetic Resonance Imaging (MRI) is a relevant imaging modality tool for breast cancer screening. Moreover, an accurate 3D segmentation of breast tumors from MRI scans plays a key role in the analysis of the disease. This paper presents a pipeline to automatically segment multiple tumors in breast MRI scans, following the metho...
Analysis of physiological responses during pain induction
Sebastião, Raquel; Bento, Ana; Brás, SusanaPain is a complex phenomenon that arises from the interaction of multiple neuroanatomic and neurochemical systems with several cognitive and affective processes. Nowadays, the assessment of pain intensity still relies on the use of self-reports. However, recent research has shown a connection between the perception of pain and exacerbated stress response in the Autonomic Nervous System. As a result, there has b...
Initial study using electrocardiogram for authentication and identification
Pereira, Teresa M. C.; Conceição, Raquel C.; Sebastião, RaquelRecently, several studies have demonstrated the potential of electrocardiogram (ECG) to be used as a physiological signature for biometric systems (BS). We investigated the potential of ECG as a biometric trait for the identification and authentication of individuals. We used data from a public database, CYBHi, containing two off-the-person records from 63 subjects, separated by 3 months. For the BS, two templa...
A preliminary case study: predicting postoperative pain through electrocardiogram
Sebastião, RaquelCurrently pain is mainly evaluated by resorting to selfreporting instruments, turning the objective evaluation of pain barely impossible. Besides the inherent subjectivity due to these reports, the perception of pain is influenced by several factors. Moreover, cognitive impairments and difficulties in expressing pose a burden difficulty in pain evaluation. Beyond less efficient pain management, the consequences...
Characterization of postoperative pain through electrocardiogram: a first approach
Sebastião, RaquelCurrent standard practices to evaluate pain are mainly based on self-reporting instruments. However, pain perception is subjective and influenced by several factors, making objective evaluation difficult. In turn, the pain may not be correctly managed, and over or under dosage of analgesics are reported as leading to undesirable side-effects, which can be potentially harmful. Considering the relevance of a quan...