2025
Authors
Sajed, S; Rostami, H; Garcia, JE; Keshavarz, A; Teixeira, A;
Publication
INTERNATIONAL JOURNAL OF IMAGING SYSTEMS AND TECHNOLOGY
Abstract
The increasing global burden of lung diseases necessitates the development of improved diagnostic tools. According to the WHO, hundreds of millions of individuals worldwide are currently affected by various forms of lung disease. The rapid advancement of artificial neural networks has revolutionized lung disease diagnosis, enabling the development of highly effective detection and classification systems. This article presents dual channel neural networks in image feature extraction based on classical CNN and vision transformers for multi-label lung disease diagnosis. Two separate subnetworks are employed to capture both global and local feature representations, thereby facilitating the extraction of more informative and discriminative image features. The global network analyzes all-organ regions, while the local network simultaneously focuses on multiple single-organ regions. We then apply a novel feature fusion operation, leveraging a multi-head attention mechanism to weight global features according to the significance of localized features. Through this multi-channel approach, the framework is designed to identify complicated and subtle features within images, which often go unnoticed by the human eye. Evaluation on the ChestX-ray14 benchmark dataset demonstrates that our hybrid model consistently outperforms established state-of-the-art architectures, including ResNet-50, DenseNet-121, and CheXNet, by achieving significantly higher AUC scores across multiple thoracic disease classification tasks. By incorporating test-time augmentation, the model achieved an average accuracy of 95.7% and a specificity of 99%. The experimental findings indicated that our model attained an average testing AUC of 87%. In addition, our method tackles a more practical clinical problem, and preliminary results suggest its feasibility and effectiveness. It could assist clinicians in making timely decisions about lung diseases.
2025
Authors
Aplugi, G; Santos, A;
Publication
World Journal of Information Systems
Abstract
2025
Authors
Dias, M; Lopes, CT;
Publication
RESEARCH CHALLENGES IN INFORMATION SCIENCE, RCIS 2025, PT II
Abstract
Entity linking is an important task in medical natural language processing (NLP) for converting unstructured text into structured data for clinical analysis and semantic interoperability. However, in lower-resource languages, this task is challenging due to the limited availability of domain-specific resources. This paper explores a translation-based cross-lingual entity linking approach using GPT models, GPT-3.5 and GPT-4o, for zero-shot machine translation and entity linking with in-context learning. We evaluate our approach using a Portuguese-English parallel dataset of radiology abstracts. Our results show that chunk-level machine translation outperforms sentence-level translation. Moreover, our translationbased approach to cross-lingual entity linking of UMLS concepts outperformed the multilingual encoder method baseline. However, the in-context learning entity linking approach did not outperform a translation-based approach with a dictionary-based entity linking method.
2025
Authors
Valina, L; Teixeira, B; Pinto, T; Vale, Z; Coelho, S; Fontes, S; Reis, A;
Publication
HCI INTERNATIONAL 2024-LATE BREAKING PAPERS, HCII 2024, PT II
Abstract
Artificial Intelligence (AI) is now ubiquitous in daily life, significantly impacting society by supporting decision-making. However, in many application areas, understanding the rationale behind AI decisions is crucial, highlighting the need for explainable AI (XAI). AI algorithms often lack transparency, making it hard to understand their inner workings. This work presents an overview of XAI solutions for decision support in mobility context. It addresses the complexity of explaining decision support models by offering explanations in various formats tailored to different user profiles. By integrating language models, XAI models may generate texts with varying technical detail levels, aiding ethical AI deployment and bridging the gap between complex models and human interpretability. This work explores the need for flexible explanation formats, supporting varied user profiles with graphical, textual, and tabular explanations. By integrating natural language processing models personalized explanations that are accurate, understandable, and accessible to a diverse audience can be generated. This study ultimately aims to support the task of making XAI robust and user-friendly, boosting its widespread use and application.
2025
Authors
Teixeira, C; Gomes, I; Cunha, L; Soares, C; van Rijn, JN;
Publication
PROGRESS IN ARTIFICIAL INTELLIGENCE, EPIA 2024, PT II
Abstract
As machine learning technologies are increasingly adopted, the demand for responsible AI practices to ensure transparency and accountability grows. To better understand the decision-making processes of machine learning models, GASTeN was developed to generate realistic yet ambiguous synthetic data near a classifier's decision boundary. However, the results were inconsistent, with few images in the low-confidence region and noise. Therefore, we propose a new GASTeN version with a modified architecture and a novel loss function. This new loss function incorporates a multi-objective measure with a Gaussian loss centered on the classifier probability, targeting the decision boundary. Our study found that while the original GASTeN architecture yields the highest Frechet Inception Distance (FID) scores, the updated version achieves lower Average Confusion Distance (ACD) values and consistent performance across low-confidence regions. Both architectures produce realistic and ambiguous images, but the updated one is more reliable, with no instances of GAN mode collapse. Additionally, the introduction of the Gaussian loss enhanced this architecture by allowing for adjustable tolerance in image generation around the decision boundary.
2025
Authors
Ana Luisa Fernandes; Purificação Silvano; António Leal; Nuno Guimarães; Rita Rb-Silva; Luís Filipe Cunha; Alípio Jorge;
Publication
Proceedings of the 19th Linguistic Annotation Workshop (LAW-XIX-2025)
Abstract
The development of a robust annotation scheme
and corresponding guidelines is crucial for pro-
ducing annotated datasets that advance both lin-
guistic and computational research. This paper
presents a case study that outlines a method-
ology for designing an annotation scheme and
its guidelines, specifically aimed at represent-
ing morphosyntactic and semantic information
regarding temporal features, as well as medi-
cal information in medical reports written in
Portuguese. We detail a multi-step process that
includes reviewing existing frameworks, con-
ducting an annotation experiment to determine
the optimal approach, and designing a model
based on these findings. We validated the ap-
proach through a pilot experiment where we
assessed the reliability and applicability of the
annotation scheme and guidelines. In this ex-
periment, two annotators independently anno-
tated a patient's medical report consisting of six
documents using the proposed model, while a
curator established the ground truth. The analy-
sis of inter-annotator agreement and the annota-
tion results enabled the identification of sources
of human variation and provided insights for
further refinement of the annotation scheme
and guidelines.
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