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671 results on '"Mendonça, Ana Maria"'

7. Automatic Eye-Tracking-Assisted Chest Radiography Pathology Screening

Author

Santos, Rui, Pedrosa, João, Mendonça, Ana Maria, Campilho, Aurélio, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Pertusa, Antonio, editor, Gallego, Antonio Javier, editor, Sánchez, Joan Andreu, editor, and Domingues, Inês, editor

Published
2023
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12. DR$\vert$GRADUATE: uncertainty-aware deep learning-based diabetic retinopathy grading in eye fundus images

Author

Araújo, Teresa, Aresta, Guilherme, Mendonça, Luís, Penas, Susana, Maia, Carolina, Carneiro, Ângela, Mendonça, Ana Maria, and Campilho, Aurélio

Subjects
Electrical Engineering and Systems Science - Image and Video Processing, Computer Science - Computer Vision and Pattern Recognition, Computer Science - Machine Learning
Abstract

Diabetic retinopathy (DR) grading is crucial in determining the adequate treatment and follow up of patients, but the screening process can be tiresome and prone to errors. Deep learning approaches have shown promising performance as computer-aided diagnosis(CAD) systems, but their black-box behaviour hinders the clinical application. We propose DR$\vert$GRADUATE, a novel deep learning-based DR grading CAD system that supports its decision by providing a medically interpretable explanation and an estimation of how uncertain that prediction is, allowing the ophthalmologist to measure how much that decision should be trusted. We designed DR$\vert$GRADUATE taking into account the ordinal nature of the DR grading problem. A novel Gaussian-sampling approach built upon a Multiple Instance Learning framework allow DR$\vert$GRADUATE to infer an image grade associated with an explanation map and a prediction uncertainty while being trained only with image-wise labels. DR$\vert$GRADUATE was trained on the Kaggle training set and evaluated across multiple datasets. In DR grading, a quadratic-weighted Cohen's kappa (QWK) between 0.71 and 0.84 was achieved in five different datasets. We show that high QWK values occur for images with low prediction uncertainty, thus indicating that this uncertainty is a valid measure of the predictions' quality. Further, bad quality images are generally associated with higher uncertainties, showing that images not suitable for diagnosis indeed lead to less trustworthy predictions. Additionally, tests on unfamiliar medical image data types suggest that DR$\vert$GRADUATE allows outlier detection. The attention maps generally highlight regions of interest for diagnosis. These results show the great potential of DR$\vert$GRADUATE as a second-opinion system in DR severity grading., Comment: Published at Medical Image Analysis (Elsevier). Publication licensed under the Creative Commons CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/. Figures are compressed due to file size constraints

Published
2019
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16. Lesion-Based Chest Radiography Image Retrieval for Explainability in Pathology Detection

Author

Pedrosa, João, Sousa, Pedro, Silva, Joana, Mendonça, Ana Maria, Campilho, Aurélio, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Pinho, Armando J., editor, Georgieva, Petia, editor, Teixeira, Luís F., editor, and Sánchez, Joan Andreu, editor

Published
2022
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18. UOLO - automatic object detection and segmentation in biomedical images

Author

Araújo, Teresa, Aresta, Guilherme, Galdran, Adrian, Costa, Pedro, Mendonça, Ana Maria, and Campilho, Aurélio

Subjects
Computer Science - Computer Vision and Pattern Recognition, Computer Science - Machine Learning, Statistics - Machine Learning
Abstract

We propose UOLO, a novel framework for the simultaneous detection and segmentation of structures of interest in medical images. UOLO consists of an object segmentation module which intermediate abstract representations are processed and used as input for object detection. The resulting system is optimized simultaneously for detecting a class of objects and segmenting an optionally different class of structures. UOLO is trained on a set of bounding boxes enclosing the objects to detect, as well as pixel-wise segmentation information, when available. A new loss function is devised, taking into account whether a reference segmentation is accessible for each training image, in order to suitably backpropagate the error. We validate UOLO on the task of simultaneous optic disc (OD) detection, fovea detection, and OD segmentation from retinal images, achieving state-of-the-art performance on public datasets., Comment: Publised on DLMIA 2018. Licensed under the Creative Commons CC-BY-NC-ND 4.0 license: http://creativecommons.org/licenses/by-nc-nd/4.0/

Published
2018
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21. Towards Adversarial Retinal Image Synthesis

Author

Costa, Pedro, Galdran, Adrian, Meyer, Maria Inês, Abràmoff, Michael David, Niemeijer, Meindert, Mendonça, Ana Maria, and Campilho, Aurélio

Subjects
Computer Science - Computer Vision and Pattern Recognition, Computer Science - Learning, Statistics - Machine Learning
Abstract

Synthesizing images of the eye fundus is a challenging task that has been previously approached by formulating complex models of the anatomy of the eye. New images can then be generated by sampling a suitable parameter space. In this work, we propose a method that learns to synthesize eye fundus images directly from data. For that, we pair true eye fundus images with their respective vessel trees, by means of a vessel segmentation technique. These pairs are then used to learn a mapping from a binary vessel tree to a new retinal image. For this purpose, we use a recent image-to-image translation technique, based on the idea of adversarial learning. Experimental results show that the original and the generated images are visually different in terms of their global appearance, in spite of sharing the same vessel tree. Additionally, a quantitative quality analysis of the synthetic retinal images confirms that the produced images retain a high proportion of the true image set quality.

Published
2017

25. Optic Disc and Fovea Detection in Color Eye Fundus Images

Author

Mendonça, Ana Maria, Melo, Tânia, Araújo, Teresa, Campilho, Aurélio, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Campilho, Aurélio, editor, Karray, Fakhri, editor, and Wang, Zhou, editor

Published
2020
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26. A Multi-dataset Approach for DME Risk Detection in Eye Fundus Images

Author

Carvalho, Catarina, Pedrosa, João, Maia, Carolina, Penas, Susana, Carneiro, Ângela, Mendonça, Luís, Mendonça, Ana Maria, Campilho, Aurélio, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Campilho, Aurélio, editor, Karray, Fakhri, editor, and Wang, Zhou, editor

Published
2020
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30. Convolutional Neural Network Architectures for Texture Classification of Pulmonary Nodules

Author

Ferreira, Carlos A., Cunha, António, Mendonça, Ana Maria, Campilho, Aurélio, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Vera-Rodriguez, Ruben, editor, Fierrez, Julian, editor, and Morales, Aythami, editor

Published
2019
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31. IDRiD: Diabetic Retinopathy – Segmentation and Grading Challenge

Author

Porwal, Prasanna, Pachade, Samiksha, Kokare, Manesh, Deshmukh, Girish, Son, Jaemin, Bae, Woong, Liu, Lihong, Wang, Jianzong, Liu, Xinhui, Gao, Liangxin, Wu, TianBo, Xiao, Jing, Wang, Fengyan, Yin, Baocai, Wang, Yunzhi, Danala, Gopichandh, He, Linsheng, Choi, Yoon Ho, Lee, Yeong Chan, Jung, Sang-Hyuk, Li, Zhongyu, Sui, Xiaodan, Wu, Junyan, Li, Xiaolong, Zhou, Ting, Toth, Janos, Baran, Agnes, Kori, Avinash, Chennamsetty, Sai Saketh, Safwan, Mohammed, Alex, Varghese, Lyu, Xingzheng, Cheng, Li, Chu, Qinhao, Li, Pengcheng, Ji, Xin, Zhang, Sanyuan, Shen, Yaxin, Dai, Ling, Saha, Oindrila, Sathish, Rachana, Melo, Tânia, Araújo, Teresa, Harangi, Balazs, Sheng, Bin, Fang, Ruogu, Sheet, Debdoot, Hajdu, Andras, Zheng, Yuanjie, Mendonça, Ana Maria, Zhang, Shaoting, Campilho, Aurélio, Zheng, Bin, Shen, Dinggang, Giancardo, Luca, Quellec, Gwenolé, and Mériaudeau, Fabrice

Published
2020
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35. Deep Convolutional Artery/Vein Classification of Retinal Vessels

Author

Meyer, Maria Ines, Galdran, Adrian, Costa, Pedro, Mendonça, Ana Maria, Campilho, Aurélio, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Campilho, Aurélio, editor, Karray, Fakhri, editor, and ter Haar Romeny, Bart, editor

Published
2018
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36. Creation of Retinal Mosaics for Diabetic Retinopathy Screening: A Comparative Study

Author

Melo, Tânia, Mendonça, Ana Maria, Campilho, Aurélio, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Campilho, Aurélio, editor, Karray, Fakhri, editor, and ter Haar Romeny, Bart, editor

Published
2018
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37. A Pixel-Wise Distance Regression Approach for Joint Retinal Optical Disc and Fovea Detection

Author

Meyer, Maria Ines, Galdran, Adrian, Mendonça, Ana Maria, Campilho, Aurélio, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Frangi, Alejandro F., editor, Schnabel, Julia A., editor, Davatzikos, Christos, editor, Alberola-López, Carlos, editor, and Fichtinger, Gabor, editor

Published
2018
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38. A No-Reference Quality Metric for Retinal Vessel Tree Segmentation

Author

Galdran, Adrian, Costa, Pedro, Bria, Alessandro, Araújo, Teresa, Mendonça, Ana Maria, Campilho, Aurélio, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Frangi, Alejandro F., editor, Schnabel, Julia A., editor, Davatzikos, Christos, editor, Alberola-López, Carlos, editor, and Fichtinger, Gabor, editor

Published
2018
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40. MINERAL MONAZITA, FONTE DE ELEMENTOS TERRAS RARAS, NUMA JAZIDA IMPORTANTE DA PARAÍBA

Author

Amorim, Jaquelynne, primary, Ferreira, Andrea Lopes de Oliveira, additional, Mendonça, Ana Maria Gonçalves Duarte, additional, Barros Neto, Jahy, additional, Silva, Alexandra Bernardo da, additional, Santos, Tardelles Oliveira, additional, Lima, Priscila Talita Barros de, additional, Nogueira, Hilda Camila Nascimento, additional, Moraes, Thalis Felipe Pereira de, additional, and Siqueira, Maurílio Leite, additional

Published
2021
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43. Improving Convolutional Neural Network Design via Variable Neighborhood Search

Author

Araújo, Teresa, Aresta, Guilherme, Almada-Lobo, Bernardo, Mendonça, Ana Maria, Campilho, Aurélio, Hartmanis, Juris, Founding Editor, van Leeuwen, Jan, Series Editor, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Kobsa, Alfred, Series Editor, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Series Editor, Pandu Rangan, C., Editorial Board Member, Sudan, Madhu, Series Editor, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Vardi, Moshe Y, Series Editor, Goos, Gerhard, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Karray, Fakhri, editor, Campilho, Aurélio, editor, and Cheriet, Farida, editor

Published
2017
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44. Adversarial Synthesis of Retinal Images from Vessel Trees

Author

Costa, Pedro, Galdran, Adrian, Meyer, Maria Ines, Mendonça, Ana Maria, Campilho, Aurélio, Hartmanis, Juris, Founding Editor, van Leeuwen, Jan, Series Editor, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Kobsa, Alfred, Series Editor, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Series Editor, Pandu Rangan, C., Editorial Board Member, Sudan, Madhu, Series Editor, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Vardi, Moshe Y, Series Editor, Goos, Gerhard, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Karray, Fakhri, editor, Campilho, Aurélio, editor, and Cheriet, Farida, editor

Published
2017
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45. A Deep Neural Network for Vessel Segmentation of Scanning Laser Ophthalmoscopy Images

Author

Meyer, Maria Ines, Costa, Pedro, Galdran, Adrian, Mendonça, Ana Maria, Campilho, Aurélio, Hartmanis, Juris, Founding Editor, van Leeuwen, Jan, Series Editor, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Kobsa, Alfred, Series Editor, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Series Editor, Pandu Rangan, C., Editorial Board Member, Sudan, Madhu, Series Editor, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Vardi, Moshe Y, Series Editor, Goos, Gerhard, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Karray, Fakhri, editor, Campilho, Aurélio, editor, and Cheriet, Farida, editor

Published
2017
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50. Characterisation of modified asphalt mixtures with lignin of pinus and eucalyptus woods.

Author

Gonçalves Duarte Mendonça, Ana Maria, de Medeiros Melo Neto, Osires, Guedes Rodrigues, John Kennedy, de Lima, Robson Kel Batista, Silva, Ingridy Minervina, and Marques, Agilio Tomaz

Subjects
*LIGNINS, *TENSILE tests, *BIOPOLYMERS, *ASPHALT, *PINE, *EUCALYPTUS
Abstract

Lignin is a natural polymer that has antioxidant properties. However, a supplied lignin's physical, chemical, and rheological behaviour will differ from the source. Thus, the objective of this work was to investigate the mechanical performance of asphalt mixtures produced with asphalt binders modified by lignins at the contents of 0, 3, 6, and 9%, from pinus and eucalyptus sawdust. The mixtures were evaluated by performing the Splitting Tensile Strength Test, Lottman, Resilient Modulus, and Dynamic Modulus. The results pointed to lignin, both tested, as a good natural polymer due to the increase in resilience of the asphalt mixtures and reduction of susceptibility to moisture for the proposed contents. Therefore, it is suitable for field use. Lignin can be identified as a residual modifier that can provide longer service life to asphalt coatings, presenting itself as an alternative modifier to the synthetic elastomeric polymers. The addition of 3% pinus lignin presented the best mechanical performance, followed by the addition of 9% eucalyptus lignin. [ABSTRACT FROM AUTHOR]

Published
2023
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