Abstract
Modern datasets are often multiway in nature and can contain patterns common to a mode of the data (e.g. space, time, and subjects). Multiway decomposition such as parallel factor analysis (PARAFAC) take into account the intrinsic structure of the data, and sparse versions of these methods improve interpretability of the results. Here we propose a variational Bayesian parallel factor analysis (VB-PARAFAC) model and an extension with sparse priors (SP-PARAFAC). Notably, our formulation admits time and subject specific noise modeling as well as subject specific offsets (i.e., mean values). We confirmed the validity of the models through simulation and performed exploratory analysis of positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) data. Although more constrained, the proposed models performed similarly to more flexible models in approximating the PET data, which supports its robustness against noise. For fMRI, both models correctly identified task-related components, but were not able to segregate overlapping activations.
Original language | English |
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Title of host publication | Medical Computer Vision and Bayesian and Graphical Models for Biomedical Imaging |
Volume | 10081 |
Publisher | Springer |
Publication date | 2017 |
Pages | 186-198 |
ISBN (Print) | 9783319611877 |
DOIs | |
Publication status | Published - 2017 |
Event | 19th International Conference on Medical Image Computing and Computer Assisted Intervention - InterContinental Athenaeum Athens, Athens, Greece Duration: 17 Oct 2016 → 21 Oct 2016 Conference number: 19 |
Conference
Conference | 19th International Conference on Medical Image Computing and Computer Assisted Intervention |
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Number | 19 |
Location | InterContinental Athenaeum Athens |
Country/Territory | Greece |
City | Athens |
Period | 17/10/2016 → 21/10/2016 |
Series | Lecture Notes in Computer Science |
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Volume | 10081 |
ISSN | 0302-9743 |
Keywords
- Computer Science
- Image Processing and Computer Vision
- Health Informatics
- Artificial Intelligence (incl. Robotics)
- Probability and Statistics in Computer Science
- Math Applications in Computer Science
- Pattern Recognition