Prof. Kalle Åström Profile

Prof. Kalle Åström

Professor at Lund Univ

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Publications (6)

Proceedings Article | 7 April 2023 Presentation + Paper

Classification of point-of-care ultrasound in breast imaging using deep learning

Jennie Karlsson, Ida Arvidsson, Freja Sahlin, Kalle Åström, Niels Christian Overgaard, Kristina Lång, Anders Heyden

Proceedings Volume 12465, 124650Y (2023) https://doi.org/10.1117/12.2654251

KEYWORDS: Data modeling, Ultrasonography, Breast cancer, Breast, Image classification, Point-of-care devices, Breast imaging, Diagnostics, Cross validation

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Proceedings Article | 4 April 2022 Poster + Paper

Machine learning algorithm for classification of breast ultrasound images

Jennie Karlsson, Jennifer Ramkull, Ida Arvidsson, Anders Heyden, Kalle Åström, Niels Christian Overgaard, Kristina Lång

Proceedings Volume 12033, 120331T (2022) https://doi.org/10.1117/12.2611824

KEYWORDS: Data modeling, Ultrasonography, Breast, Tumor growth modeling, Breast cancer, Performance modeling, Machine learning, Diagnostics, Image classification, Convolutional neural networks

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Breast cancer is the most common type of cancer globally. Early detection is important for reducing the morbidity and mortality of breast cancer. The aim of this study was to evaluate the performance of different machine learning models to classify malignant or benign lesions on breast ultrasound images. Three different convolutional neural network approaches were implemented: (a) Simple convolutional neural network, (b) transfer learning using pre-trained InceptionV3, ResNet50V2, VGG19 and Xception and (c) deep feature networks based on combinations of the four transfer networks in (b). The data consisted of two breast ultrasound image data sets: (1) an open, single-vendor, data set collected by Cairo University at Baheya Hospital, Egypt, consisting of 437 benign lesions and 210 malignant lesions, where 10% was set to be a test set and the rest was used for training and validation (development) and (2) An in-house, multi-vendor data set collected at Unilabs Mammography Unit, Skåne University Hospital, Sweden, consisting of 13 benign lesions and 265 malignant lesions, was used as an external test set. Both test sets were used for evaluating the networks. The performance measures used were area under the receiver operating characteristic curve (AUC), sensitivity, specificity and weighted accuracy. Holdout, i.e. the splitting of the development data into training and validation data sets just once, was used to find a model with as good performance as possible. 10-fold cross-validation was also performed to provide uncertainty estimates. For the transfer networks which were obtained with holdout, Gradient-weighted Class Activation Mapping was used to generate heat maps indicating which part of the image contributed to the network’s decision. For 10-fold cross-validation it was possible to achieve a mean AUC of 92% and mean sensitivity of 95% for the transfer network based on Xception when testing on the first data set. When testing on the second data set it was possible to obtain a mean AUC of 75% and mean sensitivity of 86% for the combination of ResNet50V2 and Xception.

Proceedings Article | 15 February 2021 Presentation + Paper

Detection of left bundle branch block and obstructive coronary artery disease from myocardial perfusion scintigraphy using deep neural networks

Ida Arvidsson, Niels Christian Overgaard, Anette Davidsson, Jeronimo Frias Rose, Kalle Aström, Miguel Ochoa Figueroa, Anders Heyden

Proceedings Volume 11597, 115970N (2021) https://doi.org/10.1117/12.2580890

KEYWORDS: Arteries, Scintigraphy, Neural networks, Visualization, Visual analytics, Receivers, Cameras, Brain-machine interfaces

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Proceedings Article | 16 March 2020 Paper

Domain-adversarial neural network for improved generalization performance of Gleason grade classification

Ida Arvidsson, Niels Christian Overgaard, Agnieszka Krzyzanowska, Felicia-Elena Marginean, Athanasios Simoulis, Anders Bjartell, Kalle Aström, Anders Heyden

Proceedings Volume 11320, 1132016 (2020) https://doi.org/10.1117/12.2549011

KEYWORDS: Neural networks, Data modeling, Network architectures, Tissues, RGB color model, Mathematical modeling, Performance modeling, Prostate cancer, Biopsy, Medicine

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Proceedings Article | 18 March 2019 Paper

Automatic detection of small areas of Gleason grade 5 in prostate tissue using CNN

Kasper Tall, Ida Arvidsson, Niels Christian Overgaard, Kalle Aström, Anders Heyden

Proceedings Volume 10956, 109560E (2019) https://doi.org/10.1117/12.2512924

KEYWORDS: Prostate, Tissues, Cancer, Prostate cancer, Biopsy, Neural networks, RGB color model, Convolutional neural networks, Image classification

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Proceedings Article | 1 March 2017 Paper

Automatic Gleason grading of H and E stained microscopic prostate images using deep convolutional neural networks

Anna Gummeson, Ida Arvidsson, Mattias Ohlsson, Niels Overgaard, Agnieszka Krzyzanowska, Anders Heyden, Anders Bjartell, Kalle Aström

Proceedings Volume 10140, 101400S (2017) https://doi.org/10.1117/12.2253620

KEYWORDS: Convolutional neural networks, Prostate cancer, Prostate, Neural networks, Pathology, Image segmentation, RGB color model, Machine learning, Machine vision, Computer vision technology, Cancer, Tissues, Image classification, Inspection, Biopsy, Pattern recognition

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