• The 99% accuracy club 

      Møllersen, Kajsa (Conference object; Konferansebidrag, 2021)
      <p>Melanoma Classification - a 10,000$ competition. For the 2020 Melanoma Classification competition hosted by kaggle, 33,126 images were made available for training (of which 2% were melanomas), and an additional 10,982 were used for final ranking of the 3,308 teams who entered the competition with eyes on the 10,000$ prize. The task was simple: provide a probability for melanoma (deadly skin cancer) ...
    • The blind leading the blind? Filling the knowledge gap by student peer assessment 

      Møllersen, Kajsa (Conference object; Konferansebidrag, 2023-03)
      Prior knowledge in certain mathematical topics is essential for fundamental understanding of most STEM subjects, and closing the gap from secondary education is a prerequisite for success. The teacher's dilemma in higher education is the time dedicated to teaching secondary level maths versus the course's actual curriculum. To close the knowledge gap for a group of PhD students at the Faculty of ...
    • Cancer detection for white urban Americans 

      Møllersen, Kajsa; Bongo, Lars Ailo; Tafavvoghi, Masoud (Conference object; Konferansebidrag, 2023-06)
      Development, validation and comparison of machine learning methods require access to data, sometimes lots of data. Within health applications, data sharing can be restricted due to patient privacy, and the few publicly available data sets become even more valuable for the machine learning community. One such type of data are H&E whole slide images (WSI), which are stained tumour tissue, used in ...
    • Changes in maternal risk factors and their association with changes in cesarean sections in Norway between 1999 and 2016: A descriptive population-based registry study 

      Nedberg, Ingvild Hersoug; Lazzerini, Marzia; Mariani, Ilaria; Møllersen, Kajsa; Valente, Emanuelle Pessa; Anda, Erik Eik; Skjeldestad, Finn Egil (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-03)
      Background - Increases in the proportion of the population with increased likelihood of cesarean section (CS) have been postulated as a driving force behind the rise in CS rates worldwide. The aim of the study was to assess if changes in selected maternal risk factors for CS are associated with changes in CS births from 1999 to 2016 in Norway.<p> <p>Methods and findings - This national ...
    • Comparison of computer systems and ranking criteria for automatic melanoma detection in dermoscopic images 

      Møllersen, Kajsa; Zortea, Maciel; Schopf, Thomas Roger Griesbeck; Kirchesch, Herbert M.; Godtliebsen, Fred (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-12-21)
      Melanoma is the deadliest form of skin cancer, and early detection is crucial for patient survival. Computer systems can assist in melanoma detection, but are not widespread in clinical practice. In 2016, an open challenge in classification of dermoscopic images of skin lesions was announced. A training set of 900 images with corresponding class labels and semi-automatic/manual segmentation masks ...
    • Computer-aided decision support for melanoma detection applied on melanocytic and non-melanocytic skin lesions: a comparison of two systems based on automatic analysis of dermoscopic images 

      Møllersen, Kajsa; Kirchesch, Herbert M.; Zortea, Maciel; Schopf, Thomas Roger Griesbeck; Hindberg, Kristian; Godtliebsen, Fred (Journal article; Tidsskriftartikkel; Peer reviewed, 2015)
      Commercially available clinical decision support systems (CDSSs) for skin cancer have been designed for the detection of melanoma only. Correct use of the systems requires expert knowledge, hampering their utility for nonexperts. Furthermore, there are no systems to detect other common skin cancer types, that is, nonmelanoma skin cancer (NMSC). As early diagnosis of skin cancer is essential, there ...
    • Effect of Codend Design and Postponed Bleeding on Hemoglobin in Cod Fillets Caught by Bottom Trawl in the Barents Sea Demersal Fishery 

      Jensen, Tonje Kristin; Tobiassen, Torbjørn Inge; Heia, Karsten; Møllersen, Kajsa; Larsen, Roger B.; Esaiassen, Margrethe (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-03)
      Previous studies have reported that cod caught using a newly developed dual sequential codend showed significant reduction in external catch-related damage compared to cod caught by a conventional codend. In this study, it was investigated whether this new codend affects residual blood in cod fillets and/or mitigates the effect of postponed bleeding. Residual blood was assessed by measuring ...
    • Instance Segmentation of Microscopic Foraminifera 

      Johansen, Thomas Haugland; Sørensen, Steffen Aagaard; Møllersen, Kajsa; Godtliebsen, Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-16)
      Foraminifera are single-celled marine organisms that construct shells that remain as fossils in the marine sediments. Classifying and counting these fossils are important in paleo-oceanographic and -climatological research. However, the identification and counting process has been performed manually since the 1800s and is laborious and time-consuming. In this work, we present a deep learning-based ...
    • Integrative, multi-omics, analysis of blood samples improves model predictions: applications to cancer 

      Ponzi, Erica; Thoresen, Magne; Haugdahl Nøst, Therese; Møllersen, Kajsa (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-05)
      <i>Background</i> - Cancer genomic studies often include data collected from several omics platforms. Each omics data source contributes to the understanding of the underlying biological process via source specific (“individual”) patterns of variability. At the same time, statistical associations and potential interactions among the different data sources can reveal signals from common biological ...
    • Melanoma detection Colour, clustering and classification 

      Møllersen, Kajsa (Doctoral thesis; Doktorgradsavhandling, 2016-02-19)
      Malignant melanoma is the deadliest form of skin cancer, and successful treatment relies on early detection. Undiagnosed skin lesions can be photographed and the images fed into a computer system that potentially differentiates malignant from benign lesions. To develop the melanoma detection system, various methods from statistics, machine learning and image analysis are applied. An image consists ...
    • Numbers, tables and statistics 

      Møllersen, Kajsa (Conference object; Konferansebidrag, 2021)
      <p>The old “Lofoten Post” building sits at the end of the dock in Svolvær as an empty shell, ready for the winter storms to seal its destiny. Everything that reminds of newspaper production is stripped from the building, only dents from the editor’s desk can still be seen on the floor. Wait! A stack of newspapers, filled with tables of fishery, trade, crimes, and everything else that transforms small ...
    • On Data-Independent Properties for Density-Based Dissimilarity Measures in Hybrid Clustering 

      Møllersen, Kajsa; Dhar, Subhra; Godtliebsen, Fred (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-12)
      Hybrid clustering combines partitional and hierarchical clustering for computational effectiveness and versatility in cluster shape. In such clustering, a dissimilarity measure plays a crucial role in the hierarchical merging. The dissimilarity measure has great impact on the final clustering, and data-independent properties are needed to choose the right dissimilarity measure for the problem ...
    • Pizza made healthy – an epidemiological cookbook 

      Møllersen, Kajsa (Conference object; Konferansebidrag, 2021)
    • A Pragmatic Machine Learning Approach to Quantify Tumor-Infiltrating Lymphocytes in Whole Slide Images 

      Shvetsov, Nikita; Grønnesby, Morten; Pedersen, Edvard; Møllersen, Kajsa; Rasmussen Busund, Lill-Tove; Schwienbacher, Ruth; Bongo, Lars Ailo; Kilvær, Thomas Karsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-16)
      Increased levels of tumor-infiltrating lymphocytes (TILs) indicate favorable outcomes in many types of cancer. The manual quantification of immune cells is inaccurate and time-consuming for pathologists. Our aim is to leverage a computational solution to automatically quantify TILs in standard diagnostic hematoxylin and eosin-stained sections (H&E slides) from lung cancer patients. Our approach ...
    • A Probabilistic Bag-to-Class Approach to Multiple-Instance Learning 

      Møllersen, Kajsa; Hardeberg, Jon Yngve; Godtliebsen, Fred (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-26)
      Multi-instance (MI) learning is a branch of machine learning, where each object (bag) consists of multiple feature vectors (instances)—for example, an image consisting of multiple patches and their corresponding feature vectors. In MI classification, each bag in the training set has a class label, but the instances are unlabeled. The instances are most commonly regarded as a set of points in a ...
    • Recent advances in hyperspectral imaging for melanoma detection 

      Johansen, Thomas Haugland; Møllersen, Kajsa; Ortega, Samuel; Fabelo, Himar; Garcia, Aday; Callico, Gustavo; Godtliebsen, Fred (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-22)
      Skin cancer is one of the most common types of cancer. Skin cancers are classified as nonmelanoma and melanoma, with the first type being the most frequent and the second type being the most deadly. The key to effective treatment of skin cancer is early detection. With the recent increase of computational power, the number of algorithms to detect and classify skin lesions has increased. The overall ...
    • Reproduction study using public data of: Development and validation of a deep learning algorithm for detection of diabetic retinopathy in retinal fundus photographs 

      Voets, Mike; Møllersen, Kajsa; Bongo, Lars Ailo (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-06)
      We have attempted to reproduce the results in <i>Development and validation of a deep learning algorithm for detection of diabetic retinopathy in retinal fundus photographs</i>, published in JAMA 2016; 316(22), using publicly available data sets. We re-implemented the main method in the original study since the source code is not available. The original study used non-public fundus images from EyePACS ...
    • Surgeon’s experience and clinical outcome after retropubic tension‐free vaginal tape - A case series 

      Holdø, Bjørn; Møllersen, Kajsa; Verelst, Margareta; Milsom, Ian; Svenningsen, Rune; Skjeldestad, Finn Egil (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-27)
      <i>Introduction</i> - The retropubic tension‐free vaginal tape procedure has been the preferred method for primary surgical treatment of stress and stress‐dominant mixed urinary incontinence in women for more than 20 years. In this study, we assessed associations between surgeon's experience with the primary tension‐free vaginal tape procedure and both perioperative complications and recurrence ...
    • Unsupervised segmentation of skin lesions 

      Møllersen, Kajsa (Master thesis; Mastergradsoppgave, 2008-11-15)
      During the last decades, the incidence rate of cutaneous malignant melanoma, a type of skin cancer developing from melanocytic skin lesions, has risen to alarmingly high levels. As there is no effective treatment for advanced melanoma, recognizing the lesion at an early stage is crucial for successful treatment. A trained expert dermatologist has an accuracy of around 75 % when diagnosing melanoma, ...